CFESA Diagnostic Troubleshooting

Question 1

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:

Accepted Answer

The door gaskets and thermostat calibration

Answer

The condenser fan blade pitch

Answer

The compressor motor winding resistance

Answer

The liquid line filter drier color indicator

Question 2

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

Accepted Answer

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

Answer

The equipment is operating normally under full load

Answer

The circuit breaker is undersized

Answer

The power supply voltage is too low

Question 3

What is the correct method to test a commercial heating element for an open circuit?

Accepted Answer

Use a multimeter set to resistance (ohms) to measure element resistance with power off

Answer

Apply power and measure temperature rise

Answer

Use a clamp meter with power on

Answer

Apply 120V and check for heat output

Question 4

A commercial ice machine produces small, misshapen ice cubes. The most likely cause is:

Accepted Answer

Low water pressure or clogged water distribution tube

Answer

Refrigerant overcharge

Answer

Faulty ice thickness probe

Answer

Condenser fan running backward

Question 5

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

Accepted Answer

Verify power supply voltage and check the thermostat for continuity

Answer

Replace the heating element

Answer

Check the water level probe

Answer

Replace the temperature controller

Question 6

When diagnosing an intermittent fault on commercial food equipment, the most effective approach is:

Accepted Answer

Recreate the fault condition, monitor all relevant parameters, and use wiring diagrams to isolate the circuit

Answer

Replace all major components until the fault goes away

Answer

Wait for the fault to occur and observe the symptom only

Answer

Replace the control board as it is the most likely cause of intermittent faults