Maytag Refrigerator Compressor Start Relay Ohms Reading... | appliancefaults.com

Technical Background:

The start relay provides a boost of current to the compressor motor during startup. The overload protector is a safety device that protects the compressor from overheating by cutting off power if the compressor draws excessive current. The MCU controls the start relay based on temperature sensor readings. Voltage is supplied from the breaker panel via a standard 120V AC outlet.

Symptoms:

The refrigerator is not cooling, the compressor is not running, or you hear a clicking sound coming from the compressor area. The overload protector may be tripping repeatedly. The interior light might be on but the compressor fails to start. The fan motors might be working normally.

Possible Causes:

Faulty start relay
Overload protector tripping
Compressor winding failure
Wiring harness damage
Main Control Unit (MCU) malfunction
Power supply issues

Solution:

1

Unplug the refrigerator from the outlet.
2

Locate the compressor start relay, typically attached to the compressor. It's usually a small black plastic component.
3

Disconnect the wiring harness from the start relay. Use a 1/4-inch nut driver if necessary to remove any retaining screws.
4

Using a multimeter set to ohms, test the resistance across the relay's terminals. A typical reading should be between 3-12 ohms, but consult the service manual for the exact specification. An open or shorted relay indicates a fault.
5

Check the overload protector for continuity. It should read close to zero ohms. If it's open, it's likely tripped, indicating an issue with the compressor or start relay.
6

Inspect the compressor windings for shorts to ground using the multimeter. Resistance between each winding terminal and the compressor body should be infinite. A low resistance reading indicates a shorted compressor.
7

If the start relay or overload protector is faulty, replace it with a new, OEM-approved part. If the compressor windings are bad, the compressor needs replacement, which may require a certified technician.

Safety Warning:

Always disconnect power (LOTO - Lock Out Tag Out) before working on electrical components. Refrigerator circuits operate at 120V AC and can be dangerous. If you are not comfortable working with electricity, consult a qualified appliance technician.

Prevention:

Clean the condenser coils regularly (every 6 months) to ensure proper airflow and prevent the compressor from overheating. Avoid overloading the refrigerator with too much food, as this can cause the compressor to work harder. Ensure the refrigerator is level.

Expert Tip:

Sometimes, gently tapping the start relay with the handle of a screwdriver can temporarily revive it. If the compressor starts, it confirms the relay is failing. To enter service mode on some Maytag models, press and hold the freezer and refrigerator temperature down buttons simultaneously for 5 seconds. This allows you to run diagnostic tests.

Follow-up Questions:

Frequently Asked Questions

•What are the typical ohm readings for the compressor windings on this Maytag refrigerator?

Typically, the run winding should be between 1-5 ohms, and the start winding should be between 3-12 ohms. Consult the service manual for your specific model for precise values.

•How do I identify the correct replacement start relay for my Maytag refrigerator?

Locate the model number of your refrigerator. Then, search online appliance parts retailers or contact Maytag directly with the model number to find the compatible start relay. Ensure it's an OEM or approved replacement part.

•What other components should I check if the compressor start relay keeps failing?

Check the compressor windings for shorts or open circuits. Also, inspect the capacitor (if equipped) for damage or leakage. A failing compressor or a bad capacitor can cause excessive current draw, leading to start relay failure.

Maytag Refrigerator Compressor Start Relay Ohms Reading Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical ohm readings for the compressor windings on this Maytag refrigerator?

•How do I identify the correct replacement start relay for my Maytag refrigerator?

•What other components should I check if the compressor start relay keeps failing?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: