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

Technical Background:

The start relay provides a boost to the compressor motor during startup. The main control unit (MCU) sends a signal to the relay. The relay energizes, momentarily providing voltage to the start winding of the compressor. If the compressor doesn't start, the relay de-energizes, and the cycle repeats, creating the clicking sound. Voltage paths include the 120V AC supply to the MCU, from the MCU to the relay, and from the relay to the compressor windings.

Symptoms:

The refrigerator is plugged in, but the compressor is not running. You hear a clicking sound, likely from the start relay attempting to engage the compressor, but the compressor never actually starts. The refrigerator is not cooling.

Possible Causes:

Faulty start relay
Defective compressor
Overload protector tripped
Wiring issues between the start relay and compressor
Low voltage to the refrigerator
Faulty main control board (MCU)

Solution:

1

Unplug the refrigerator from the 120V AC outlet and allow several minutes for the system to equalize pressures.
2

Locate the start relay and overload protector, typically mounted on the side of the compressor.
3

Use a multimeter to test the start relay for continuity. A failed relay will show open or very high resistance.
4

Test the compressor windings for continuity. An open winding indicates a failed compressor. Check for shorts to ground from each terminal to the compressor body. High resistance to ground indicates a possible short.
5

Check the voltage at the outlet using a multimeter. Ensure you are getting a consistent 120V AC. Low voltage can prevent the compressor from starting.
6

Inspect the wiring between the start relay, overload, and compressor for any damage or loose connections. Repair or replace as needed.
7

If all components test okay, the main control board (MCU) may be faulty and require replacement. This is less common but possible.

Safety Warning:

Disconnect power (LOTO) before performing any repairs. Refrigeration systems operate at high pressures and contain refrigerant. Wear appropriate safety gear, including safety glasses and gloves. The compressor electrical components operate at 120V AC and present a shock hazard.

Prevention:

Regularly clean the condenser coils using a vacuum cleaner. Ensure proper ventilation around the refrigerator. Avoid overloading the refrigerator with excessive amounts of food.

Expert Tip:

Some Amana models have a forced defrost or diagnostic mode accessible by pressing a specific sequence of buttons on the control panel. Consult the service manual for the exact sequence. This can sometimes temporarily resolve compressor issues.

Frequently Asked Questions

•How do I test the compressor windings with a multimeter?

Set your multimeter to the ohms setting. Test between each of the three compressor terminals (common, start, run). You should see relatively low resistance (typically a few ohms) between each terminal pair. Also, test from each terminal to the compressor body (ground). You should see very high resistance (megaohms or open circuit) indicating no short to ground.

•What is the proper resistance range for a good start relay?

A good start relay should have continuity through its coil. Check the specifications for your specific relay if available. Generally, you should see a low resistance value, but not a direct short (0 ohms). An open circuit (infinite resistance) indicates a faulty relay.

•How do I know if the overload protector is tripped?

The overload protector is a safety device that interrupts power to the compressor if it overheats. If it has tripped, it will have an open circuit. After allowing it to cool down, it should regain continuity. You can test it with a multimeter set to continuity. If it remains open even after cooling, it is likely faulty.

Amana Refrigerator Start Relay Clicking, Compressor Not Starting: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the compressor windings with a multimeter?

•What is the proper resistance range for a good start relay?

•How do I know if the overload protector is tripped?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: