CFESA Food Equipment Maintenance 5 — Questions and Answers
Question 1: A commercial refrigeration unit's compressor runs continuously but the box temperature never reaches setpoint. Suction pressure is lower than normal and discharge pressure is also low. What does this most likely indicate?
- Refrigerant undercharge (low charge) (Correct answer)
- Refrigerant overcharge (high charge)
- Condenser coil fouled with grease
- Evaporator fan motor failure
Correct answer: Refrigerant undercharge (low charge)
Both low suction and low discharge pressure together are classic indicators of an insufficient refrigerant charge in the system.
Question 2: What is the recommended maintenance frequency for cleaning condenser coils on commercial refrigeration equipment in a kitchen environment with heavy grease-laden air?
- Annually
- Every 3–6 months (Correct answer)
- Every 5 years
- Only when a fault code is triggered
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 3: A tilting braising pan's electric heating elements show correct resistance but the unit heats unevenly. What is the most probable cause?
- Failed contactor
- Air pockets or degraded thermal contact between elements and the pan bottom (Correct answer)
- Incorrect voltage supply
- Faulty temperature probe location
Correct answer: Air pockets or degraded thermal contact between elements and the pan bottom
Even with electrically sound elements, poor thermal contact caused by air gaps or warped surfaces results in uneven heat transfer to the pan bottom.
Question 4: When performing maintenance on a commercial garbage disposal, what safety step must be completed before reaching into the grinding chamber?
- Turn the reset button to the off position
- Disconnect electrical power and verify it is locked out/tagged out (Correct answer)
- Run water through the unit for 30 seconds to flush debris
- Switch the unit to reverse mode
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 5: A combi oven's humidity sensor is suspected to be faulty. Which symptom would most directly point to a failed humidity sensor?
- Oven fails to reach temperature setpoint
- 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
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 6: 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?
- Adjust the door hinge pivot bolt to increase friction
- Replace the door springs with manufacturer-specified components (Correct answer)
- Add a door latch catch as a workaround
- 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 7: A commercial meat slicer's blade drive belt shows glazing and cracking during a PM inspection. The unit is still operational. What action should the technician take?
- Apply belt dressing compound to restore friction
- Schedule belt replacement at the next available PM
- Replace the belt immediately before returning the unit to service (Correct answer)
- Document the finding and monitor for another 90 days
Correct answer: Replace the belt immediately before returning the unit to service
A glazed and cracked drive belt is at imminent risk of failure; continued operation risks the blade stopping unexpectedly or the belt breaking during use, creating a safety hazard.
CFESA Food Equipment Maintenance 5
A commercial refrigeration unit's compressor runs continuously but the box temperature never reaches setpoint.
Suction pressure is lower than normal and discharge pressure is also low.
What does this most likely indicate?