CFESA Diagnostic Troubleshooting 4

Question 1

A commercial convection oven heats unevenly, with the back hotter than the front. Which component is most likely failing?

Accepted Answer

Convection fan motor

Answer

A failing convection fan motor reduces or disrupts airflow, causing uneven heat distribution within the oven cavity.

Question 2

A walk-in cooler compressor short-cycles every 2-3 minutes. After ruling out refrigerant issues, what should the technician check next?

Accepted Answer

High-pressure cutout switch

Answer

A high-pressure cutout switch tripping repeatedly causes short-cycling and often indicates condenser fouling or airflow restriction.

Question 3

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

Accepted Answer

Clogged or blocked wash arm ports

Answer

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

Question 4

A gas fryer burner lights but extinguishes within 30 seconds. The technician confirms adequate gas pressure. What is the most probable fault?

Accepted Answer

Faulty thermocouple or flame sensor

Answer

A weak or failed thermocouple/flame sensor cannot generate sufficient millivoltage to hold the gas valve open, causing burner dropout.

Question 5

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

Accepted Answer

Confirm the steam solenoid valve is opening

Answer

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

CFESA - Commercial Food Equipment Service Association Practice Test