Maytag Refrigerator Compressor Not Starting in Cold... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) controls the compressor operation based on temperature sensor inputs. The MCU sends a 120V AC signal to the compressor start relay. A failing start relay, overload, or compressor itself can prevent startup. Low ambient temperatures can affect compressor oil viscosity, making startup more difficult. Voltage drops in the wiring can also affect startup.

Symptoms:

The homeowner observes that the Maytag refrigerator compressor is not starting, and this issue seems to be more prevalent when the refrigerator is located in a cold garage.

Possible Causes:

Low ambient temperature affecting the compressor oil.
Faulty start relay or overload protector.
Defective compressor.
Malfunctioning Main Control Unit (MCU).
Wiring harness issue between the MCU and compressor.

Solution:

1

Verify the outlet is supplying 120V AC using a multimeter. If no voltage, check the breaker panel.
2

Inspect the compressor start relay and overload protector. Disconnect power. Remove the components and test for continuity using a multimeter. Replace if faulty.
3

Check the compressor windings for continuity using a multimeter. Disconnect power. Resistance should be within specified ranges. If open or shorted, the compressor is likely defective.
4

Examine the wiring harness for any loose connections or damaged wires. Repair or replace as needed.
5

Check the voltage output from the MCU to the compressor start relay. Disconnect power, then reconnect and measure the voltage signal to the relay when the compressor is expected to start. Consult the service manual for specified voltage levels.
6

Try a hard start kit. Install a hard start capacitor and relay to assist the compressor's startup.
7

As a last resort, if all components check out, suspect a faulty MCU and replace it.

Safety Warning:

Always disconnect power (Lock Out/Tag Out - LOTO) to the refrigerator before performing any repairs. High voltage is present in the electrical components. Use caution when testing live circuits.

Prevention:

Avoid placing the refrigerator in environments where ambient temperatures consistently drop below 55 degrees Fahrenheit. Regularly clean the condenser coils to ensure proper heat dissipation. Consider a refrigerator designed for garage use.

Expert Tip:

Many Maytag refrigerators have a service mode that can be accessed by pressing and holding certain button combinations (refer to the service manual). This mode may allow you to force the compressor to start for testing purposes. Note that forcing the compressor to run when it shouldn't can cause damage.

Frequently Asked Questions

•What are the typical resistance values for a Maytag refrigerator compressor?

Typical resistance values vary depending on the compressor model but are usually between 2 and 15 ohms between each winding. Check the service manual for specific values for your compressor.

•How do I test the start relay and overload protector?

Disconnect power. Remove the relay and overload. Use a multimeter to check for continuity across the terminals of the overload. If open, replace. Test the start relay by shaking it. If it rattles, replace. Also, check the PTC resistance. It should have a low resistance when cold and a very high resistance when warm.

•Where can I find the service manual for my Maytag refrigerator?

The service manual can often be found online by searching the model number of your refrigerator followed by 'service manual'. AppliancePartsPros.com or similar websites may have it available for download.

Maytag Refrigerator Compressor Not Starting in Cold Garage: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical resistance values for a Maytag refrigerator compressor?

•How do I test the start relay and overload protector?

•Where can I find the service manual for my Maytag refrigerator?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: