CAR Troubleshooting & Diagnostics 3

Question 1

A microwave oven turns on but does not heat food. Which component is MOST likely faulty?

Accepted Answer

Magnetron tube

Answer

The magnetron generates the microwave energy that heats food; if it fails, the oven operates normally except no heating occurs.

Question 2

A refrigerator makes a clicking noise every few minutes but the compressor never starts. Which component should be tested?

Accepted Answer

Start relay or overload protector

Answer

A faulty start relay or overload protector repeatedly attempts and fails to start the compressor, producing a clicking sound each cycle.

Question 3

During recycling intake, an oven's broil element works but the bake element does not. What is the FIRST diagnostic step?

Accepted Answer

Check for continuity in the bake element with a multimeter

Answer

Testing continuity in the bake element confirms whether the element is open-circuited before condemning or replacing it.

Question 4

A front-load washer displays an E3 or UE error code during spin. What does this typically indicate?

Accepted Answer

Load is unbalanced in the drum

Answer

An unbalanced load error (E3/UE) occurs when the drum detects uneven weight distribution that could damage the machine during high-speed spin.

Question 5

Which symptom MOST suggests a faulty defrost heater in a frost-free refrigerator?

Accepted Answer

Excessive frost buildup on evaporator coils

Answer

A failed defrost heater cannot melt accumulated frost from the evaporator coils, leading to heavy frost buildup that restricts airflow and cooling.

(CAR) Certified Appliance Recycler Practice Test