Hotpoint Refrigerator Compressor Overheating and Not... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) governs the operation of the refrigerator, including the compressor. It sends a 120V AC signal to the compressor via a start relay/overload. The start relay provides a boost to start the compressor, while the overload protects it from overheating. If the MCU detects a fault, it may shut down the compressor.

Symptoms:

The homeowner observes that the Hotpoint refrigerator is not cooling. The compressor, located at the back of the unit, is excessively hot to the touch.

Possible Causes:

Failed compressor start relay/overload.
Defective condenser fan motor.
Sealed system restriction or refrigerant leak.
Faulty main control board (MCU).
Compressor winding failure.
Excessive dirt and debris on condenser coils.

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the compressor at the rear of the refrigerator.
3

Check the compressor start relay/overload. Use a multimeter to test for continuity. Replace if defective.
4

Inspect the condenser fan motor. Ensure it spins freely and is receiving 120V AC when the compressor is running (or attempting to run). Replace if faulty.
5

Clean the condenser coils with a vacuum cleaner and brush. Excessive dust buildup restricts airflow.
6

If the above steps don't resolve the issue, suspect a sealed system problem. This requires a certified technician with EPA Section 608 certification to diagnose and repair.
7

Check the voltage to the compressor from the MCU. If voltage is present and correct, the compressor itself may be faulty.

Safety Warning:

Always disconnect power before working on the refrigerator. Lock Out/Tag Out (LOTO) procedures must be followed. The appliance operates on 120V AC, which can cause serious injury or death. If you are not comfortable working with electricity, contact a qualified technician.

Prevention:

Clean the condenser coils every 6 months with a vacuum cleaner and brush. Ensure proper ventilation around the refrigerator.

Expert Tip:

Some Hotpoint refrigerators have a service mode. To access it, press and hold the freezer and refrigerator temperature adjustment buttons simultaneously for 5 seconds. This allows you to run diagnostic tests.

Frequently Asked Questions

•What is the proper resistance reading for a good compressor winding?

Typically, a good compressor winding should have a low resistance reading, usually between 2 and 10 ohms, but this can vary by model. Check the service manual for your specific Hotpoint refrigerator.

•How do I know if the compressor is receiving the correct voltage from the MCU?

Use a multimeter set to AC voltage. Place the probes on the compressor terminals where the wires from the MCU connect. You should read approximately 120V AC when the compressor is supposed to be running. Verify the wiring diagram.

•What type of refrigerant does this Hotpoint refrigerator use, and what are the safety precautions for handling it?

Most modern Hotpoint refrigerators use R-134a or R600a refrigerant. R-134a is a synthetic refrigerant and R600a is isobutane (flammable). Only a certified technician with EPA Section 608 certification can handle refrigerants. Always wear safety glasses and gloves. Ensure proper ventilation when working with refrigerants.

Hotpoint Refrigerator Compressor Overheating and Not Cooling: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance reading for a good compressor winding?

•How do I know if the compressor is receiving the correct voltage from the MCU?

•What type of refrigerant does this Hotpoint refrigerator use, and what are the safety precautions for handling it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: