Amana Refrigerator: Start Relay Clicking, Compressor Not... | appliancefaults.com

Technical Background:

The refrigerator's MCU (Main Control Unit) sends a signal to the start relay, which then energizes the compressor. The start relay provides an initial boost to the compressor motor. The overload protector is designed to trip and shut down the compressor if it overheats or draws excessive current. Voltage follows from the breaker panel to the outlet, then to the MCU, and finally to the relay.

Symptoms:

The Amana refrigerator is plugged in, and you can hear a clicking sound coming from the back, near the compressor. The compressor does not start or run, and the refrigerator is not cooling.

Possible Causes:

Faulty start relay
Defective compressor
Overload protector tripping
Wiring issue between the relay and compressor
Low voltage supply
Locked rotor in the compressor

Solution:

1

Unplug the refrigerator from the wall outlet.
2

Locate the start relay, overload protector, and compressor in the compressor compartment (usually at the back of the refrigerator).
3

Use a 1/4-inch nut driver to remove the cover to access the start relay.
4

Inspect the start relay for any visible signs of damage, such as burning or cracking.
5

Use a multimeter to test the start relay for continuity. If the relay is open or shorted, replace it.
6

Check the compressor windings using a multimeter to ensure they are within the specified resistance range. Open windings indicate a failed compressor.
7

Verify 120V AC is present at the start relay input when the refrigerator is attempting to start.

Safety Warning:

Always disconnect the power to the refrigerator before performing any repairs. Follow Lock Out/Tag Out (LOTO) procedures to prevent accidental energization. Refrigerant lines contain pressurized refrigerant; do not attempt to cut or disconnect them without proper training and equipment. High voltage is present when the refrigerator is powered on.

Prevention:

Periodically clean the condenser coils (located at the back or bottom of the refrigerator) with a vacuum cleaner and brush attachment to ensure proper airflow and prevent compressor overheating. Check the voltage at the outlet to ensure it's within the range of 110-120V AC.

Expert Tip:

If the compressor hums briefly before the relay clicks, try using a hard start kit. This can provide additional starting torque to overcome a potentially weak compressor. Service mode (if available): Press and hold the freezer temperature down and refrigerator temperature up buttons simultaneously for 5 seconds. This may display diagnostic codes.

Frequently Asked Questions

•What are the typical resistance values I should expect to see when testing the compressor windings?

Typically, the resistance between the common and start windings will be higher than the resistance between the common and run windings. Consult the refrigerator's service manual for the specific resistance values for your model. A common range is 2-15 ohms.

•How can I test the overload protector to see if it's tripping prematurely?

You can test the overload protector for continuity using a multimeter. It should have continuity when cold. If it opens up quickly when heated gently with a heat gun (be careful not to overheat), it's likely functioning correctly. If it's open when cold, it's faulty.

•If I replace the start relay and the compressor still doesn't start, what should I do next?

If replacing the start relay doesn't fix the issue, the compressor is likely the problem and may need to be replaced. However, before replacing the compressor, also check the wiring harness and connections between the start relay, overload protector, and compressor for any breaks, corrosion, or loose connections.

Amana Refrigerator: Start Relay Clicking, Compressor Not Starting Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical resistance values I should expect to see when testing the compressor windings?

•How can I test the overload protector to see if it's tripping prematurely?

•If I replace the start relay and the compressor still doesn't start, what should I do next?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: