CFESA Certified Food Equipment Service Technician Exam — Questions and Answers

Question 1: What causes a compressor to short cycle in a commercial refrigeration unit?

Dirty evaporator coil
Low refrigerant charge causing rapid pressure equalization (Correct answer)
Oversize expansion valve
High ambient temperature

Correct answer: Low refrigerant charge causing rapid pressure equalization

A low refrigerant charge can cause the low-pressure control to cycle the compressor on and off rapidly as pressures equalize quickly.

Question 2: A commercial ice machine produces small, cloudy ice cubes. What is the MOST likely cause?

High mineral content in the water supply (Correct answer)
Faulty harvest temperature sensor
Low water pressure to the machine
Refrigerant overcharge in the system

Correct answer: High mineral content in the water supply

High mineral content (hard water) causes cloudy, small ice cubes because minerals become trapped in the ice matrix as water freezes.

Question 3: What does superheat indicate in a refrigeration system?

Temperature of the condenser coil
Subcooling at the liquid line
Discharge temperature at the compressor
Temperature rise of vapor above its saturation point (Correct answer)

Correct answer: Temperature rise of vapor above its saturation point

Superheat is the number of degrees the refrigerant vapor is above the boiling point at a given pressure, ensuring no liquid enters the compressor.

Question 4: When a technician must condemn a piece of commercial cooking equipment as beyond economical repair, what should the written report include?

Specific failure findings, estimated repair cost vs. replacement cost, and safety concerns (Correct answer)
A recommendation for a specific competing brand
Only the technician's opinion without supporting data
Only the customer's verbal description of the problem

Correct answer: Specific failure findings, estimated repair cost vs. replacement cost, and safety concerns

A complete condemnation report with cost comparisons and safety findings helps the customer make an informed replacement decision.

Question 5: What is the recommended maintenance frequency for cleaning condenser coils on commercial refrigeration equipment in a kitchen environment with heavy grease-laden air?

Only when a fault code is triggered
Annually
Every 3–6 months (Correct answer)
Every 5 years

Correct answer: Every 3–6 months

Grease-laden air rapidly clogs condenser coils, and in heavy-use kitchen environments quarterly to semi-annual cleaning is required to maintain efficiency and prevent compressor failure.

Question 6: What is the purpose of a receiver in a commercial refrigeration system?

Separate oil from the refrigerant
Store extra refrigerant and ensure liquid feed to the expansion device (Correct answer)
Measure refrigerant flow rate
Filter moisture from the refrigerant

Correct answer: Store extra refrigerant and ensure liquid feed to the expansion device

The receiver stores liquid refrigerant to accommodate system load variations and ensures a steady liquid supply to the expansion device.

Question 7: According to FDA Food Code, what is the minimum hot holding temperature for cooked foods maintained in commercial food equipment?

145°F (63°C)
135°F (57°C) (Correct answer)
150°F (66°C)
140°F (60°C)

Correct answer: 135°F (57°C)

The FDA Food Code requires cooked foods to be held at a minimum internal temperature of 135°F (57°C) to prevent bacterial growth in commercial hot holding equipment.

Question 8: When performing a preventive maintenance inspection on a commercial steamer, which component should be de-limed most frequently in areas with hard water?

Control board
Door gasket
Drain valve solenoid
Steam generator or boiler tank (Correct answer)

Correct answer: Steam generator or boiler tank

Hard water causes calcium and mineral deposits to accumulate rapidly in steam generators, reducing efficiency and potentially damaging heating elements.

Question 9: Which refrigerant property is measured by a superheat reading at the evaporator outlet?

The subcooling of refrigerant leaving the condenser
The vapor temperature above its saturation point at that pressure (Correct answer)
The amount of liquid refrigerant remaining in the evaporator
The enthalpy difference across the compressor

Correct answer: The vapor temperature above its saturation point at that pressure

Superheat is the temperature of refrigerant vapor above its saturation (boiling) temperature at a given pressure, confirming all refrigerant has vaporized.

Question 10: Subcooling in a refrigeration system refers to:

Cooling the suction line below ambient
Cooling liquid refrigerant below its condensing temperature (Correct answer)
Operating the evaporator below freezing
Reducing compressor discharge temperature

Correct answer: Cooling liquid refrigerant below its condensing temperature

Subcooling ensures the liquid refrigerant is cooled below its condensing temperature, preventing flash gas before the expansion device.

Question 11: On a commercial walk-in cooler, door gaskets should be replaced when:

They show cracks, tears, or fail to create a proper seal (Correct answer)
Every 6 months regardless of condition
Only when the cooler fails to maintain temperature
The door hinges are replaced

Correct answer: They show cracks, tears, or fail to create a proper seal

Door gaskets must be replaced when they are cracked, torn, or no longer create an airtight seal, as this causes excessive energy consumption and temperature fluctuation.

Question 12: When calibrating a commercial convection oven thermostat, a technician finds it reads 25°F high. The correct action is:

Replace the thermostat immediately
Replace the temperature probe
Adjust the calibration screw per manufacturer specification to correct the offset (Correct answer)
Advise the operator to set the temperature 25°F lower

Correct answer: Adjust the calibration screw per manufacturer specification to correct the offset

Most commercial oven thermostats have an adjustment screw that allows the technician to calibrate the setpoint to match actual oven temperature.

Question 13: A food establishment is cited for having a reach-in cooler that does not maintain proper temperature. Which regulatory body most likely issued the citation?

NSF International
ASHRAE
CFESA
Local health department (Correct answer)

Correct answer: Local health department

Local or state health departments conduct inspections of food service establishments and cite violations of food safety codes including temperature requirements.

Question 14: During a PM visit on a commercial deep fryer, the technician notices the high-limit thermostat has tripped repeatedly. After resetting, what should be inspected before returning the unit to service?

The flue exhaust screen
The pilot light orifice
The oil filtration pump motor
Oil level, thermostat calibration, and burner/element heat distribution (Correct answer)

Correct answer: Oil level, thermostat calibration, and burner/element heat distribution

Repeated high-limit trips indicate the fryer is overheating, which can be caused by low oil level, a miscalibrated operating thermostat, or uneven heat causing hot spots.

Question 15: A technician is called to service a commercial steamship round that will not heat. The first step in the diagnostic process should be:

Replace the heating element
Check the water level probe
Verify power supply voltage and check the thermostat for continuity (Correct answer)
Replace the temperature controller

Correct answer: Verify power supply voltage and check the thermostat for continuity

Diagnosing a no-heat condition starts with verifying proper voltage supply and then checking the control circuit (thermostat) for continuity before testing components.

Question 16: When repairing a commercial soft-serve machine that produces product with excessive air incorporation (too foamy), which component is most likely at fault?

The overrun adjustment valve or air pump system delivering too much air to the mix (Correct answer)
The beater motor capacitor
The mix inlet solenoid valve
The refrigeration expansion valve

Correct answer: The overrun adjustment valve or air pump system delivering too much air to the mix

Overrun is controlled by the air injection system; a stuck-open valve or malfunctioning air pump delivers excess air, producing overly airy, foamy product.

Question 17: When a technician vents more than the de minimis amount of refrigerant during service, what penalty can the EPA impose per violation?

Up to $1,000 per day
Up to $5,000 per day
Up to $25,000 per day
Up to $44,539 per day (Correct answer)

Correct answer: Up to $44,539 per day

EPA civil penalties for CAA Section 608 violations are inflation-adjusted and can reach over $44,000 per day per violation as of recent adjustments.

Question 18: A commercial gas range's igniter glows orange but the burner fails to light. What does this most likely indicate?

The igniter is weak and not reaching the minimum current threshold to open the gas valve (Correct answer)
The thermocouple is generating excess voltage
The igniter is too hot and needs to cool down
The gas valve is stuck open

Correct answer: The igniter is weak and not reaching the minimum current threshold to open the gas valve

Hot surface igniters must reach a specific current draw (typically 3-4 amps) to signal the gas valve to open; a weak igniter glows but doesn't draw enough current.

Question 19: What diagnostic information does a pressure-temperature (P-T) chart provide to a refrigeration technician?

The saturation temperature of a refrigerant at a given pressure (Correct answer)
Head pressure limits for specific ambient temperatures
Refrigerant oil viscosity requirements
Compressor motor amp draw at various pressures

Correct answer: The saturation temperature of a refrigerant at a given pressure

A P-T chart correlates refrigerant pressure to its saturation (boiling/condensing) temperature, allowing technicians to determine evaporating and condensing temperatures from gauge readings.

Question 20: What is the function of a crankcase pressure regulator (CPR) valve in a commercial refrigeration system?

Regulate discharge pressure during high ambient conditions
Maintain head pressure during low ambient temperatures
Prevent compressor overload during pulldown by limiting suction pressure (Correct answer)
Control refrigerant flow to multiple evaporators

Correct answer: Prevent compressor overload during pulldown by limiting suction pressure

A CPR valve limits the maximum suction pressure entering the compressor to prevent motor overload during high-load pulldown conditions.

Question 21: A walk-in freezer compressor short-cycles (runs briefly and shuts off repeatedly). The low-pressure cutout is tripping. What is the MOST likely cause?

Low refrigerant charge (Correct answer)
Condenser coil is dirty
Faulty high-pressure switch
Overcharge of refrigerant

Correct answer: Low refrigerant charge

A low refrigerant charge causes suction pressure to drop below the low-pressure cutout setpoint, causing the compressor to short-cycle on low pressure.

Question 22: After servicing a commercial ice machine's water circuit and evaporator, what is the recommended final step before returning the machine to food service?

Replace the water filter to ensure no residual sanitizer enters the ice supply
Sanitize the entire food-contact ice path with an NSF-approved sanitizer per the manufacturer's procedure, rinse, and document the service (Correct answer)
Run the machine for 24 hours and discard the first batch of ice as a precaution
Notify the health department that the ice machine has been serviced and request re-inspection

Correct answer: Sanitize the entire food-contact ice path with an NSF-approved sanitizer per the manufacturer's procedure, rinse, and document the service

Ice is classified as a food under FDA Food Code. Any technician-touched food-contact surface (evaporator, bin, water lines) must be cleaned and sanitized with an NSF-listed sanitizer following the manufacturer's procedures before the unit returns to service. Failing to sanitize after internal service introduces contamination risk directly into the ice supply.

Question 23: Which standard governs the ventilation requirements for commercial cooking operations, including exhaust hood specifications?

NFPA 96 (Correct answer)
NFPA 13
ANSI Z223.1
ASHRAE 62.1

Correct answer: NFPA 96

NFPA 96 (Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations) governs exhaust hood design, installation, and fire suppression requirements.

Question 24: A technician measures a high head pressure and normal suction pressure in a walk-in cooler. The most likely cause is:

Dirty condenser coils (Correct answer)
Low refrigerant charge
Stuck open TXV
Faulty evaporator fan

Correct answer: Dirty condenser coils

Dirty condenser coils restrict airflow and heat transfer, causing head pressure to rise above normal operating range.

Question 25: What is the recommended maintenance interval for changing the oil in a commercial floor-type mixer?

Only when noise is detected
Every 6 months or per manufacturer specification (Correct answer)
Annually regardless of use
Every 30 days

Correct answer: Every 6 months or per manufacturer specification

Commercial mixer gearboxes require oil changes every 6 months or per the manufacturer's schedule to maintain lubrication and prevent gear wear.

Question 26: What is the purpose of a contactor in commercial food equipment?

To protect against ground faults
To convert AC power to DC power
To regulate voltage levels
To switch high-current loads on and off via a low-current control circuit (Correct answer)

Correct answer: To switch high-current loads on and off via a low-current control circuit

A contactor uses a small control circuit to open and close contacts that switch heavy loads like compressors and heating elements.

Question 27: Which OSHA standard specifically covers electrical safety requirements that food equipment technicians must follow?

29 CFR 1910.119 (PSM)
Both 29 CFR 1910.147 and 1910.303 (Correct answer)
29 CFR 1910.303 (Electrical General Requirements)
29 CFR 1910.147 (Lockout/Tagout)

Correct answer: Both 29 CFR 1910.147 and 1910.303

Food equipment technicians must comply with both OSHA 29 CFR 1910.147 (control of hazardous energy/LOTO) and 1910.303 (general electrical safety requirements).

Question 28: Which NSF standard specifically governs the design and construction of commercial warewashing equipment?

NSF/ANSI 3 (Correct answer)
NSF/ANSI 18
NSF/ANSI 2
NSF/ANSI 4

Correct answer: NSF/ANSI 3

NSF/ANSI 3 covers the sanitation requirements for commercial warewashing equipment including dishwashers, glasswashers, and pot washers.

Question 29: Which refrigerant requires technicians to hold an EPA Section 608 Type II certification to service?

R-22 in window units
R-410A in residential split systems
R-134a in small appliances
R-404A in commercial refrigeration above 50 lbs (Correct answer)

Correct answer: R-404A in commercial refrigeration above 50 lbs

EPA Section 608 Type II certification is required for servicing high-pressure commercial and industrial refrigeration systems containing more than 50 lbs of refrigerant.

Question 30: Per OSHA 29 CFR 1910.147 (Lockout/Tagout), when must a service technician apply a personal lockout device to commercial food equipment?

Only when the equipment owner requests it in writing
When servicing equipment with more than one energy source
Whenever unexpected energization or release of stored energy could cause injury during servicing (Correct answer)
Only when working on electrical components above 480 volts

Correct answer: Whenever unexpected energization or release of stored energy could cause injury during servicing

LOTO is required any time servicing or maintenance could expose a worker to unexpected energization, startup, or release of stored energy regardless of voltage level.

Question 31: What is a common troubleshooting step for a commercial dishwasher that is not draining properly?

Adjusting the temperature settings
Increasing the water level manually
Checking for clogs in the drain line or filter (Correct answer)
Replacing the detergent dispenser

Correct answer: Checking for clogs in the drain line or filter

The most frequent reason a commercial dishwasher fails to drain is an obstruction in its drainage system. Food particles, grease, or other debris can accumulate in the drain line, filter, or pump, blocking the water flow. Inspecting and clearing these components is a primary and often effective troubleshooting step.

Question 32: When replacing a hermetic compressor in a commercial reach-in refrigerator, what procedure is MOST critical before brazing the new compressor in place?

Recover all refrigerant and pull a deep vacuum (Correct answer)
Flush the system with refrigerant to remove air
Pressurize the system with nitrogen to 150 psig
Verify the oil level in the new compressor crankcase

Correct answer: Recover all refrigerant and pull a deep vacuum

All refrigerant must be recovered before opening the system, and a deep vacuum must be pulled to remove moisture and non-condensables before recharging.

Question 33: How often should commercial dishwasher spray arm nozzles be inspected and cleaned?

Annually
Monthly
Daily or per manufacturer PM schedule (Correct answer)
Only when problems are reported

Correct answer: Daily or per manufacturer PM schedule

Commercial dishwasher spray arms should be inspected and cleaned daily or per the manufacturer's PM schedule to ensure effective warewashing.

Question 34: A technician notices oil pooling in the evaporator of a low-temperature display case. The most appropriate corrective action is:

Verify oil return lines and compressor crankcase heater operation (Correct answer)
Replace the expansion valve
Add more refrigerant
Check and increase the refrigerant charge

Correct answer: Verify oil return lines and compressor crankcase heater operation

Oil pooling in the evaporator indicates poor oil return; checking oil return lines and crankcase heater ensures oil circulates back to the compressor.

Question 35: When using a clamp meter to diagnose a commercial cooking appliance, a technician measures amp draw significantly above nameplate rating. This indicates:

The equipment is operating normally under full load
The power supply voltage is too low
The circuit breaker is undersized
A possible short circuit, failed component drawing excess current, or mechanical binding (Correct answer)

Correct answer: A possible short circuit, failed component drawing excess current, or mechanical binding

Amp draw significantly above nameplate rating indicates an electrical fault such as a short, a failed component, or mechanical resistance causing the motor to draw excess current.

Question 36: What NSF standard governs the design, construction, and material requirements for commercial food equipment?

NSF/ANSI 169
NSF/ANSI 2 (Correct answer)
NSF/ANSI 51
NSF/ANSI 3

Correct answer: NSF/ANSI 2

NSF/ANSI 2 covers the minimum food zone design and fabrication requirements for commercial food equipment to ensure cleanability and sanitation.

Question 37: In CFESA-certified businesses, what is the role of service contracts?

To avoid routine equipment inspections
To guarantee regular income and ensure preventative maintenance (Correct answer)
To reduce customer interactions
To increase complexity in billing

Correct answer: To guarantee regular income and ensure preventative maintenance

Service contracts provide a structured agreement for ongoing maintenance and support, offering customers peace of mind and predictable costs. For CFESA-certified businesses, these contracts ensure a steady revenue stream and allow for scheduled preventative maintenance, which helps identify and address potential issues before they become costly breakdowns, extending equipment lifespan and improving reliability.

Question 38: What is the purpose of the deliming procedure on a commercial combi oven?

Calibrate the cooking thermostat
Remove grease buildup from burners
Remove mineral scale deposits from steam-generating components (Correct answer)
Clean the convection fan blades

Correct answer: Remove mineral scale deposits from steam-generating components

Deliming removes calcium and mineral scale deposits from steam generators and water circuits to maintain steam output and prevent equipment damage.

Question 39: What is the minimum final rinse temperature required for a commercial high-temperature dishwasher to sanitize tableware?

160°F
200°F
180°F (Correct answer)
140°F

Correct answer: 180°F

High-temperature commercial dishwashers must achieve a minimum 180°F rinse temperature at the rack surface to sanitize tableware per food safety codes.

Question 40: A gas range burner produces a yellow, lifting flame instead of a blue cone flame. What is the most likely cause?

Insufficient primary air or partially blocked air shutter (Correct answer)
Cracked burner cap
High gas supply pressure
Excess primary air at the air shutter

Correct answer: Insufficient primary air or partially blocked air shutter

A yellow, lifting flame indicates incomplete combustion due to insufficient primary air mixing with the gas before ignition.

Question 41: Which of the following best describes the role of a Technical Advisory Council (TAC) member within CFESA?

Manages CFESA's annual conference logistics
Advises on technical training content and certification exam standards (Correct answer)
Handles billing disputes between member companies
Approves new CFESA member applications

Correct answer: Advises on technical training content and certification exam standards

The TAC advises CFESA leadership on technical training curriculum, certification exam content, and industry standards to keep them relevant and accurate.

Question 42: What condition is indicated when a compressor's suction line frosts heavily all the way back to the compressor?

Normal operating condition
Low refrigerant charge
High ambient temperature
Overcharge of refrigerant or a flooding TXV (Correct answer)

Correct answer: Overcharge of refrigerant or a flooding TXV

Heavy frosting on the suction line extending to the compressor indicates liquid refrigerant is returning to the compressor, risking liquid slugging.

Question 43: When inspecting a commercial steam table's water pan, you notice a white crusty buildup. The correct corrective action is to:

Increase the water temperature to dissolve the deposits during operation
Replace the entire water pan immediately
Apply a coat of food-safe oil to prevent future buildup
Delime the pan using an approved food-safe acid solution and rinse thoroughly (Correct answer)

Correct answer: Delime the pan using an approved food-safe acid solution and rinse thoroughly

White crusty deposits are mineral scale (lime) that can be safely removed with a food-safe acidic deliming solution, followed by thorough rinsing before returning to service.

Question 44: A commercial convection oven heats unevenly — hot on one side and cool on the other. After confirming the fan operates, the technician should check:

Individual heating elements or burner sections for open circuits or uneven output (Correct answer)
Gas supply pressure only
The thermostat probe location
The door gasket on the cool side only

Correct answer: Individual heating elements or burner sections for open circuits or uneven output

Uneven heating in a convection oven is often caused by a failed heating element or burner on one side; checking individual elements for open circuits isolates the faulty component.

Question 45: During startup, a steam kettle pressure gauge reads normal but the kettle is not heating. Which diagnostic step should be performed first?

Check the steam trap for failure
Confirm the steam solenoid valve is opening (Correct answer)
Inspect the safety relief valve
Verify the condensate return line

Correct answer: Confirm the steam solenoid valve is opening

If pressure is present but heat is absent, the steam solenoid valve may be stuck closed and preventing steam from entering the jacket.

Question 46: What does R-454B refrigerant represent in terms of regulatory compliance?

A refrigerant banned under SNAP for commercial use
A natural refrigerant requiring special handling only in Europe
A banned ozone-depleting substance
A low-GWP HFO blend approved as an A2L refrigerant to replace R-410A (Correct answer)

Correct answer: A low-GWP HFO blend approved as an A2L refrigerant to replace R-410A

R-454B is a low global warming potential (GWP) A2L refrigerant blend approved by the EPA SNAP program as a replacement for R-410A in commercial applications.

Question 47: A technician's company is considering whether to invest in CFESA membership. Which argument best supports the return on investment?

CFESA negotiates parts pricing directly with all manufacturers
CFESA membership eliminates the need for liability insurance
Membership provides free labor law compliance audits
Access to certified technicians, technical resources, and industry credibility improves service quality and business competitiveness (Correct answer)

Correct answer: Access to certified technicians, technical resources, and industry credibility improves service quality and business competitiveness

CFESA membership enhances a company's competitive position through access to training, certifications, and industry resources that directly improve service quality and reputation.

Question 48: ASHRAE Standard 90.1 affects commercial food equipment technicians primarily because it:

Establishes minimum energy efficiency requirements for commercial refrigeration and HVAC equipment (Correct answer)
Governs gas appliance BTU ratings
Sets refrigerant recovery requirements
Sets dishwasher water consumption limits

Correct answer: Establishes minimum energy efficiency requirements for commercial refrigeration and HVAC equipment

ASHRAE 90.1 establishes minimum energy efficiency standards that commercial refrigeration equipment must meet, influencing equipment selection and replacement decisions.

Question 49: A CFESA-certified technician notices safety code violations on equipment while performing a routine service call. What is the appropriate professional response?

Ignore the violations since the scope of work is limited to the requested repair
Report the violations anonymously to the health department without telling the customer
Document the violations, inform the customer in writing, and recommend corrective action (Correct answer)
Immediately shut down the establishment without customer consent

Correct answer: Document the violations, inform the customer in writing, and recommend corrective action

Professional ethics require documenting safety hazards and informing the customer, creating a record that protects both parties.

Question 50: Which CFESA certification is considered the highest level of professional achievement for a commercial food equipment technician?

CFESA Certified Master Technician (CCMT) (Correct answer)
Master Certified Food Equipment Technician (MCFET)
Senior Food Equipment Specialist (SFES)
Certified Food Equipment Service Technician (CFEST)

Correct answer: CFESA Certified Master Technician (CCMT)

The CFESA Certified Master Technician (CCMT) designation represents the highest level of professional recognition offered by CFESA.

Question 51: When performing maintenance on a commercial garbage disposal, what safety step must be completed before reaching into the grinding chamber?

Disconnect electrical power and verify it is locked out/tagged out (Correct answer)
Turn the reset button to the off position
Switch the unit to reverse mode
Run water through the unit for 30 seconds to flush debris

Correct answer: Disconnect electrical power and verify it is locked out/tagged out

LOTO (lockout/tagout) is mandatory before any hands-on maintenance inside a disposal to prevent accidental activation of the cutting mechanism.

Question 52: Which of the following best represents a long-term career path for an experienced CFESA-certified technician who enjoys teaching?

Transitioning to restaurant ownership
Becoming a CFESA-approved trainer or technical school instructor (Correct answer)
Moving into commercial real estate appraisal
Pursuing a medical device technician license

Correct answer: Becoming a CFESA-approved trainer or technical school instructor

Experienced technicians with strong teaching skills can leverage their expertise by becoming CFESA-approved trainers or instructors, advancing the next generation of food equipment professionals.

Question 53: What is the purpose of the scrap screen or pre-flush trough in a commercial conveyor dishwasher?

To measure the volume of water used per rack
To capture loose silverware so it is not conveyed through the machine
To filter detergent before it enters the wash tank
To remove food soil from dishes before the main wash cycle to prevent tank contamination (Correct answer)

Correct answer: To remove food soil from dishes before the main wash cycle to prevent tank contamination

The scrap screen/pre-flush zone removes gross food debris from dishes before they enter the wash tank. Without it, soil would rapidly contaminate the wash water, reducing detergent effectiveness and requiring more frequent tank changes.

Question 54: A commercial dishwasher's final rinse temperature consistently reads 160°F instead of the required 180°F. After confirming the booster heater element is functional, what should be checked next?

Detergent dispenser timing
Incoming water pressure and flow rate to the booster (Correct answer)
Door switch adjustment
Spray arm nozzle blockage

Correct answer: Incoming water pressure and flow rate to the booster

Insufficient water flow through the booster heater means the water does not spend enough time in contact with the heating element to reach 180°F.

Question 55: A commercial refrigerator compressor runs continuously but the cabinet temperature is too warm. After confirming proper refrigerant charge and airflow, the technician should next check:

The compressor motor winding resistance
The condenser fan blade pitch
The door gaskets and thermostat calibration (Correct answer)
The liquid line filter drier color indicator

Correct answer: The door gaskets and thermostat calibration

Leaking door gaskets allow warm air infiltration, and an out-of-calibration thermostat may not cycle the compressor correctly — both cause continuous running without reaching setpoint.

Question 56: What is the AHJ's role in commercial food equipment installation?

Enforce local building and safety codes and approve installations (Correct answer)
Set NSF standards
Issue CFESA certifications
Manufacture and certify equipment

Correct answer: Enforce local building and safety codes and approve installations

The Authority Having Jurisdiction (AHJ) enforces local building, fire, health, and safety codes and has final approval authority over commercial equipment installations.

Question 57: Scale buildup inside a commercial steamer generator is primarily caused by:

Excessive steam pressure during operation
Using the wrong detergent during cleaning cycles
High chlorine levels in the water supply
Dissolved minerals such as calcium and magnesium precipitating out of solution when heated (Correct answer)

Correct answer: Dissolved minerals such as calcium and magnesium precipitating out of solution when heated

Calcium and magnesium bicarbonates dissolved in hard water precipitate as insoluble carbonates when heated, forming scale deposits on heating elements and generator walls.

Question 58: After replacing a thermostat on a commercial fryer, the oil continues to overheat past the setpoint. What is the most likely oversight?

The fryer needs a full oil change
The new thermostat bulb is not fully seated in its well (Correct answer)
The gas valve orifice is the wrong size
The high-limit switch needs calibration

Correct answer: The new thermostat bulb is not fully seated in its well

If the thermostat sensing bulb is not fully inserted into the capillary well, it senses a lower temperature than actual oil temperature, causing uncontrolled overheating.

Question 59: When checking for gas leaks on commercial equipment, technicians should use:

Electronic combustible gas detector or listed leak detection solution (Correct answer)
Nitrogen pressure test only
An open flame
Compressed air

Correct answer: Electronic combustible gas detector or listed leak detection solution

An electronic combustible gas detector or listed leak detection solution (never an open flame) is safe and effective for locating gas leaks.

Question 60: What is the primary refrigerant used in most modern commercial food equipment refrigeration systems?

R-134a
R-410A
R-22
R-404A (Correct answer)

Correct answer: R-404A

R-404A is widely used in commercial food refrigeration due to its compatibility with medium and low temperature applications.

Question 61: What is the purpose of a head pressure control valve (also called a flooding valve) on an air-cooled condenser in cold ambient conditions?

Prevent liquid refrigerant from flooding back to the compressor
Reduce compressor discharge temperature in summer
Maintain minimum condensing pressure by restricting liquid line flow (Correct answer)
Control refrigerant flow to a remote condenser

Correct answer: Maintain minimum condensing pressure by restricting liquid line flow

In cold weather, a head pressure control valve maintains minimum condensing pressure by partially flooding the condenser with liquid refrigerant to reduce effective coil surface.

Question 62: What does a commercial warewasher's booster heater do?

Raise incoming water temperature to the required 180°F final rinse temperature (Correct answer)
Maintain water temperature in the tank between cycles
Preheat the wash water
Heat the detergent solution

Correct answer: Raise incoming water temperature to the required 180°F final rinse temperature

A booster heater raises the building hot water supply (typically 120°F) to the 180°F minimum required for sanitizing the final rinse in high-temperature dishwashers.

Question 63: A commercial refrigerator compressor hums but does not start. The technician confirms proper voltage at the compressor terminals. What should be tested first?

Refrigerant charge level
Evaporator fan motor
Condenser coil cleanliness
Start relay and start capacitor (Correct answer)

Correct answer: Start relay and start capacitor

A humming compressor that fails to start typically indicates a faulty start relay or start capacitor that is not providing the necessary torque to initiate rotation.

Question 64: What is the function of a pressure differential switch on a commercial ice machine?

To detect a dirty condenser or refrigerant restriction and shut the unit down (Correct answer)
To regulate water flow to the ice-making grid
To control the water pump speed
To cycle the harvest valve on and off

Correct answer: To detect a dirty condenser or refrigerant restriction and shut the unit down

A pressure differential switch monitors the difference between high and low side pressures and shuts down the machine if the spread indicates a problem like a dirty condenser.

Question 65: What is the primary purpose of a liquid line filter-drier in a commercial refrigeration system?

Subcool the liquid refrigerant before the metering device
Remove moisture and contaminants from the refrigerant (Correct answer)
Separate oil from the refrigerant before the condenser
Increase refrigerant flow velocity to the evaporator

Correct answer: Remove moisture and contaminants from the refrigerant

A liquid line filter-drier removes moisture, acid, and solid contaminants from the refrigerant to protect the system components.

Question 66: What does a megohmmeter (megger) test on a compressor motor winding reveal?

Capacitor condition
Insulation resistance to detect winding-to-ground faults (Correct answer)
Winding resistance in ohms for continuity check
Motor efficiency under load

Correct answer: Insulation resistance to detect winding-to-ground faults

A megohmmeter applies high voltage to test insulation resistance between motor windings and ground, detecting insulation breakdown that can cause ground faults or motor failure.

Question 67: In service business management, 'overhead' typically includes which of the following?

Rent, utilities, insurance, and administrative salaries not directly tied to service delivery (Correct answer)
The cost of parts used in repairs
Customer refunds and credits
Technician commissions on completed jobs

Correct answer: Rent, utilities, insurance, and administrative salaries not directly tied to service delivery

Overhead consists of fixed and semi-fixed costs that support the business but are not directly attributable to individual jobs.

Question 68: A commercial dishwasher's wash arms are not rotating. The pump motor runs normally. What is the most likely cause?

Faulty door interlock switch
Clogged or blocked wash arm ports (Correct answer)
Low water temperature
Failed heating element

Correct answer: Clogged or blocked wash arm ports

Clogged wash arm ports restrict water flow and prevent the hydraulic pressure needed to spin the wash arms.

Question 69: A steam kettle is producing a hammering noise during heat-up. What is the most likely cause?

Faulty pressure relief valve
Clogged steam trap
Water hammer from condensate trapped in steam lines (Correct answer)
Excessive steam pressure

Correct answer: Water hammer from condensate trapped in steam lines

Water hammer occurs when condensate accumulates in steam lines and is struck by high-velocity steam, producing a hammering or banging noise.

Question 70: A technician finds frost forming uniformly across the entire evaporator coil in a walk-in cooler. What is the most likely cause?

Low refrigerant charge
Defective defrost heater
Overcharge of refrigerant
Restricted airflow across the coil (Correct answer)

Correct answer: Restricted airflow across the coil

Uniform frost across the entire evaporator typically indicates restricted airflow, while low charge usually causes frost only on part of the coil.

Question 71: What does the EPA's SNAP (Significant New Alternatives Policy) program regulate?

Gas appliance emission standards
Technician certification requirements
Energy efficiency of new commercial appliances
New refrigerants and substitutes for ozone-depleting substances (Correct answer)

Correct answer: New refrigerants and substitutes for ozone-depleting substances

The EPA SNAP program evaluates and regulates refrigerant alternatives to ozone-depleting substances, listing acceptable and unacceptable substitutes for specific end uses.

Question 72: A commercial steam kettle is producing inconsistent temperatures. The first component to check is:

The jacket pressure gauge and steam inlet pressure (Correct answer)
The steam trap
The mixer attachment
The drain valve

Correct answer: The jacket pressure gauge and steam inlet pressure

Inconsistent steam kettle temperatures are often caused by low or fluctuating steam supply pressure; checking the jacket pressure gauge and inlet pressure is the first diagnostic step.

Question 73: Which type of refrigerant leak detection method is BEST suited for identifying the exact location of a small leak in a hard-to-reach area of tubing?

Refrigerant standing pressure test
UV dye inspection with black light (Correct answer)
Electronic leak detector sweep
Nitrogen pressure test with soap bubbles

Correct answer: UV dye inspection with black light

UV dye previously added to the system glows under UV light, pinpointing the exact leak location even in tight or hidden areas.

Question 74: Which organization administers the EPA Section 608 technician certification exam that commercial refrigeration technicians must pass before purchasing regulated refrigerants?

EPA-approved testing organizations such as ESCO Institute or trade associations (Correct answer)
The EPA directly administers all exams
State environmental agencies in each jurisdiction
CFESA-approved testing centers only

Correct answer: EPA-approved testing organizations such as ESCO Institute or trade associations

The EPA approves third-party testing organizations—such as ESCO Institute, HVACR trade associations, and others—to administer the Section 608 certification exams.

Question 75: During a preventive maintenance visit on a commercial ice machine, a technician should routinely perform:

Replace the compressor every PM
Replace refrigerant charge
Clean condenser coils, sanitize water system, and inspect water filters and float valve (Correct answer)
Replace all water hoses

Correct answer: Clean condenser coils, sanitize water system, and inspect water filters and float valve

Ice machine PM includes cleaning condenser coils, sanitizing the water distribution system, and inspecting filters and float valves to maintain performance and sanitation.

Question 76: A commercial ice cream machine produces soft, runny product. The most probable cause is:

Excess glycol in the freezing cylinder
Beater motor running too fast
Mix temperature too cold
Refrigeration system underperforming or mix overrun too high (Correct answer)

Correct answer: Refrigeration system underperforming or mix overrun too high

Soft or runny ice cream product indicates the freezing cylinder is not reaching proper draw temperature, typically caused by refrigeration underperformance or incorrect mix overrun.

Question 77: When lubricating the door hinges and rollers of a commercial convection oven, which lubricant type is appropriate?

Silicone spray only
Standard petroleum-based grease
Food-grade high-temperature grease (NSF H1) (Correct answer)
WD-40 spray lubricant

Correct answer: Food-grade high-temperature grease (NSF H1)

NSF H1 food-grade lubricants are required for components where incidental food contact is possible, and must be rated for the high temperatures encountered near oven doors.

Question 78: When performing a descaling procedure on a commercial steamer, the technician should use:

Industrial muriatic acid undiluted
Bleach solution at 200 PPM
A food-safe acidic descaler or citric acid solution diluted per manufacturer specifications (Correct answer)
A strong alkaline degreaser at full concentration

Correct answer: A food-safe acidic descaler or citric acid solution diluted per manufacturer specifications

Acidic descalers (citric acid, phosphoric acid, or proprietary food-safe formulas) dissolve calcium/magnesium scale safely when used at manufacturer-recommended dilutions.

Question 79: During a preventive maintenance inspection, a technician finds that a commercial gas oven's door spring tension is insufficient, causing the door to fall open. What is the correct repair approach?

Add a door latch catch as a workaround
Replace the door springs with manufacturer-specified components (Correct answer)
Adjust the door hinge pivot bolt to increase friction
Weld the spring bracket for added strength

Correct answer: Replace the door springs with manufacturer-specified components

Door springs must be replaced with OEM-specified parts to ensure the correct tension that keeps the door sealed and prevents heat loss or burn hazards.

Question 80: What is the purpose of a CFESA Factory Authorized Service (FAS) program?

Regulate CFESA membership dues
Authorize service companies to perform warranty repairs on behalf of equipment manufacturers (Correct answer)
Provide free parts to certified technicians
Set technician wage standards

Correct answer: Authorize service companies to perform warranty repairs on behalf of equipment manufacturers

Factory Authorized Service programs authorize qualified service companies to perform in-warranty repairs on behalf of equipment manufacturers, ensuring quality service.

Question 81: When recovering refrigerant from commercial equipment, technicians must comply with which EPA regulation?

Section 404 of the Safe Drinking Water Act
Title V of the Clean Water Act
Section 608 of the Clean Air Act (Correct answer)
OSHA 29 CFR 1910.119

Correct answer: Section 608 of the Clean Air Act

EPA Section 608 requires technicians to recover refrigerants using certified equipment and prohibits intentional venting of regulated refrigerants.

Question 82: Which type of expansion device maintains a constant evaporator pressure regardless of load?

Automatic expansion valve (AXV) (Correct answer)
Thermostatic expansion valve (TXV)
Capillary tube
Electronic expansion valve (EEV)

Correct answer: Automatic expansion valve (AXV)

The automatic expansion valve (AXV) maintains a constant evaporator pressure by responding to pressure changes at the valve outlet.

Question 83: What is the function of a redundant safety valve (RSV) on a commercial gas appliance?

It bypasses the pressure regulator during ignition
It controls pilot flame sensing
It regulates gas pressure to the burner orifice
It provides two independent gas shutoff seats in series for added safety (Correct answer)

Correct answer: It provides two independent gas shutoff seats in series for added safety

A redundant safety valve contains two independent operator seats in series so that if one fails, the second prevents gas flow.

Question 84: A commercial steamer fails to build pressure. After checking the door gasket seal, the technician should inspect:

The steam trap
The water supply valve, water level probe, and heating elements (Correct answer)
The safety relief valve only
The condensate return line

Correct answer: The water supply valve, water level probe, and heating elements

A steamer that won't build pressure likely has insufficient water (supply valve, level probe malfunction) or insufficient heat input (failed elements) — all must be checked.

Question 85: In a commercial refrigeration system using an electronic expansion valve (EEV), which parameter does the controller primarily modulate to maintain proper superheat?

Evaporator fan speed
Valve opening percentage (Correct answer)
Compressor speed
Condenser fan speed

Correct answer: Valve opening percentage

The EEV controller adjusts the valve opening percentage based on superheat sensor feedback to maintain the target superheat setpoint.

Question 86: A reach-in display case has a warm cabinet temperature but the evaporator fan is running and no ice is visible on the coil. Suction pressure is normal. What should be checked FIRST?

Refrigerant charge level
Condenser coil cleanliness
Door gaskets and seals for air infiltration (Correct answer)
Compressor valve efficiency

Correct answer: Door gaskets and seals for air infiltration

When the refrigeration system appears to operate normally but cabinet temperature is warm, damaged door gaskets allowing warm air infiltration is the most common cause.

Question 87: A technician measures 0 volts at a commercial oven's heating element terminals while the thermostat is calling for heat. The next diagnostic step is:

Trace back through the control circuit to find the open in the circuit (thermostat contacts, safety limit, relay) (Correct answer)
Replace the element
Replace the thermostat
Check for a blown fuse in the distribution panel

Correct answer: Trace back through the control circuit to find the open in the circuit (thermostat contacts, safety limit, relay)

Zero voltage at the element with a call for heat means the control circuit is open; the technician must trace back through the wiring diagram to find the open contact or blown fuse.

Question 88: Under ANSI/ASHRAE/IESNA Standard 90.1, walk-in cooler and freezer doors must have which feature to comply with energy efficiency requirements?

Transparent panels for visual inspection
Motion-activated interior lighting only
Automatic door closers and self-sealing magnetic gaskets (Correct answer)
Anti-condensate heaters rated below 40W per linear foot

Correct answer: Automatic door closers and self-sealing magnetic gaskets

ASHRAE 90.1 requires walk-in cooler and freezer doors to include automatic door closers and self-sealing magnetic gaskets to minimize refrigeration energy losses.

Question 89: When performing a triple evacuation on a commercial refrigeration system, what gas is used between each vacuum pull to purge moisture?

Carbon dioxide
Dry nitrogen (Correct answer)
Clean refrigerant vapor
Compressed air

Correct answer: Dry nitrogen

Dry nitrogen (dew point below -60°F) is used to break the vacuum between pulls, absorbing remaining moisture before the next evacuation cycle.

Question 90: A walk-in cooler evaporator coil is heavily frosted over even though the defrost cycle runs normally. What is the most likely cause?

Door gasket failure allowing warm moist air infiltration (Correct answer)
Oversized compressor
Faulty defrost timer
Low refrigerant charge

Correct answer: Door gasket failure allowing warm moist air infiltration

A damaged door gasket allows warm, humid ambient air into the cooler, which freezes on the evaporator coil faster than defrost cycles can remove it.

Question 91: During a refrigerant leak search on commercial equipment, which method is most effective for pinpointing small leaks in tight spaces?

Ultrasonic leak detector (Correct answer)
UV dye with a UV lamp
Bubble solution
Electronic leak detector

Correct answer: Ultrasonic leak detector

Ultrasonic leak detectors can pinpoint small refrigerant leaks in confined spaces by detecting the high-frequency sound of escaping gas.

Question 92: A combi oven's humidity sensor is suspected to be faulty. Which symptom would most directly point to a failed humidity sensor?

Steam injection does not match the programmed humidity level during cooking (Correct answer)
Door latch does not engage properly
The oven displays an error code for the heating element
Oven fails to reach temperature setpoint

Correct answer: Steam injection does not match the programmed humidity level during cooking

The humidity sensor provides feedback that controls steam injection; a failed sensor means the oven cannot regulate or verify actual humidity levels during cooking.

Question 93: What is the typical prerequisite before a technician can sit for the CFESA Certified Master Technician (CCMT) examination?

Holding a current CFESA certification and meeting minimum field experience requirements (Correct answer)
Five years of college education in engineering
Passing a background check administered by CFESA
Completing an OSHA 500 instructor course

Correct answer: Holding a current CFESA certification and meeting minimum field experience requirements

The CCMT designation requires candidates to already hold CFESA certification and demonstrate substantial verified field experience before testing.

Question 94: What does it mean when a clamp-on ammeter reads current on the green (ground) wire of a piece of commercial food equipment?

The neutral wire is disconnected
Normal condition indicating proper grounding
A ground fault is present, causing current to return via the grounding conductor (Correct answer)
The equipment is operating in single-phase mode

Correct answer: A ground fault is present, causing current to return via the grounding conductor

Current flowing on the ground wire indicates a ground fault, where unintended current is finding its return path through the grounding conductor.

Question 95: What certification does CFESA offer to recognize service companies that meet standards for training, facilities, and business practices?

CFESA Premier Service Designation
CFESA Master Certification
CFESA 5-Star Certification (Correct answer)
CFESA Gold Standard Award

Correct answer: CFESA 5-Star Certification

CFESA's 5-Star Certification program recognizes service companies that demonstrate excellence in technician training, business practices, customer service, and professional standards.

Question 96: A refrigerated prep table shows ice buildup on the evaporator coil between scheduled defrosts. What condition does this most likely indicate?

Overcharge of refrigerant
Defrost heater operating too long
Restriction in the liquid line filter-drier
Excessive moisture infiltration from a failing door seal (Correct answer)

Correct answer: Excessive moisture infiltration from a failing door seal

A failing door gasket allows warm, moist ambient air to enter, which freezes on the evaporator coil faster than scheduled defrost cycles can clear it.

Question 97: A combi oven displays an error code indicating a steam generation fault. The technician confirms water supply is present. What should be inspected next?

Combustion air fan
Grease drain trap
Steam generator scale buildup or heating element failure (Correct answer)
Door latch mechanism

Correct answer: Steam generator scale buildup or heating element failure

Scale buildup on the steam generator heating element or a burned-out element are the most common causes of steam generation faults when water supply is adequate.

Question 98: In a commercial refrigeration system, what is the role of the oil separator?

Return compressor oil from the discharge line back to the crankcase (Correct answer)
Prevent oil from entering the condenser
Filter moisture from the oil
Separate refrigerant from oil in the evaporator

Correct answer: Return compressor oil from the discharge line back to the crankcase

The oil separator captures oil discharged with the hot gas and returns it to the compressor crankcase, preventing oil accumulation in the system.

Question 99: Which key performance indicator (KPI) measures how quickly a service company collects payment after issuing invoices?

Gross margin percentage
First-call completion rate
Technician utilization rate
Days sales outstanding (DSO) (Correct answer)

Correct answer: Days sales outstanding (DSO)

Days sales outstanding (DSO) measures the average number of days between invoicing and payment collection.

Question 100: What does the term 'temperature danger zone' mean in a food service context, and why is it directly relevant to a food equipment service technician?

Below 41°F only: refrigeration equipment must keep all food below this threshold to prevent freezing damage
32°F–212°F (0°C–100°C): the full range of water phase change that affects food texture during cooking
41°F–135°F (5°C–57°C): the range in which most pathogenic bacteria multiply rapidly; technicians must ensure all holding, cooking, and refrigeration equipment keeps food outside this range (Correct answer)
Above 165°F only: cooking equipment must exceed this temperature to destroy pathogens

Correct answer: 41°F–135°F (5°C–57°C): the range in which most pathogenic bacteria multiply rapidly; technicians must ensure all holding, cooking, and refrigeration equipment keeps food outside this range

The danger zone (41°F–135°F per FDA Food Code) is the temperature range where pathogenic bacteria like Salmonella, E. coli, and Listeria double rapidly. Every category of food service equipment — refrigerators, hot-holders, steam tables, cooking equipment — is engineered to keep food either below or above this range. A technician who returns a unit to service without verifying proper temperature may inadvertently enable dangerous bacterial growth.

CFESA Certified Food Equipment Service Technician Exam

The CFESA (Commercial Food Equipment Service Association) certification exam validates technical competency for commercial food equipment service technicians. The exam covers refrigeration systems, gas equipment safety and operation, preventive maintenance, industry standards and regulations, and diagnostic troubleshooting. Candidates must demonstrate hands-on knowledge of servicing and repairing commercial cooking, refrigeration, and food preparation equipment used in professional kitchens.

100

Questions

120 min

Time Limit

70%

To Pass

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