Admiral Refrigerator Compressor Overheating:... | appliancefaults.com

Technical Background:

The refrigerator's Main Control Unit (MCU) sends 120V AC to the compressor via the overload protector and starting relay. The overload protector protects the compressor from overheating. The starting relay assists the compressor motor in starting. When the compressor runs, it circulates refrigerant through the system to absorb heat from inside the refrigerator and freezer compartments.

Symptoms:

The homeowner reports the Admiral refrigerator compressor is very hot to the touch. The refrigerator is not cooling, and the freezer is not freezing. There may be no unusual noises, or the compressor may be cycling on and off frequently.

Possible Causes:

Overload protector failure.
Starting relay malfunction.
Compressor motor failure.
Condenser coil blockage.
Refrigerant leak.
Faulty MCU relay.

Solution:

1

Unplug the refrigerator from the 120V AC outlet. Locate the compressor at the back of the unit.
2

Remove the compressor access panel using a 1/4-inch nut driver.
3

Disconnect the overload protector and starting relay from the compressor.
4

Test the overload protector for continuity using a multimeter. Replace if open. The resistance should be near zero ohms.
5

Test the starting relay. A typical PTC relay should show low resistance when cold and high resistance when hot. Replace if faulty.
6

Use a multimeter to test the compressor windings for continuity and shorts to ground. A shorted winding indicates compressor failure. Check the resistance between each winding and ground. The resistance should be infinite (open circuit).
7

Inspect the condenser coils for dust and debris. Clean with a vacuum and brush if necessary.

Safety Warning:

Always disconnect the power before working on any electrical appliance. Use proper Lock-Out/Tag-Out (LOTO) procedures to prevent accidental power-up. The compressor electrical components operate at 120V AC and can cause electric shock.

Prevention:

Clean the condenser coils every six months with a vacuum cleaner. Avoid overloading the refrigerator. Ensure proper ventilation around the refrigerator.

Expert Tip:

If the compressor is running but not cooling, and the condenser coils are clean, suspect a refrigerant leak or a sealed system problem. Use a refrigerant leak detector around the compressor and lines. If a leak is detected, contact a qualified refrigeration technician to repair the leak and recharge the system. Some models have a diagnostic mode accessed by pressing specific button combinations – consult the service manual for your Admiral model.

Frequently Asked Questions

•What are the typical resistance values for a good compressor winding?

Typical resistance values for a compressor winding are usually between 2 and 15 ohms, depending on the compressor size and model. They should also be roughly equal.

•How do I check for a refrigerant leak without specialized tools?

While a refrigerant leak detector is the most accurate method, you can visually inspect the refrigerant lines and connections for signs of oil residue, which can indicate a leak. However, this method is not always reliable.

•What if the compressor is getting power but not starting, and I've replaced the start relay and overload?

If the compressor is receiving power but still not starting after replacing the start relay and overload, it's highly likely that the compressor itself has failed and needs to be replaced. Confirm proper voltage at the compressor terminals while it's attempting to start.

Admiral Refrigerator Compressor Overheating: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical resistance values for a good compressor winding?

•How do I check for a refrigerant leak without specialized tools?

•What if the compressor is getting power but not starting, and I've replaced the start relay and overload?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: