Maytag Refrigerator Compressor Hum Louder After Coil... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) cycles the compressor based on temperature readings from thermistors. A change in refrigerant pressure or airflow can cause the compressor to work harder, altering its sound. The voltage path to the compressor includes the MCU, overload relay, and start capacitor. The start capacitor provides the necessary boost for startup, while the overload relay protects against excessive current draw.

Symptoms:

The homeowner observes that the compressor hum on their Maytag refrigerator is louder than normal after cleaning the condenser coils.

Possible Causes:

Loose compressor mounting bolts.
Compressor overload relay issue.
Refrigerant leak affecting compressor operation.
Fan motor obstruction or failure (condenser or evaporator fan).
Start capacitor failure.
Incorrect coil cleaning procedure causing damage or displacement.

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the compressor at the rear of the refrigerator.
3

Inspect the compressor mounting bolts for tightness. Tighten any loose bolts using a 1/2-inch wrench.
4

Check the compressor overload relay and start capacitor (usually in a housing near the compressor). Test the start capacitor with a multimeter set to capacitance. A typical value is 80-120 microfarads. Replace if out of spec.
5

Examine the condenser fan (near the compressor) and evaporator fan (inside the freezer). Ensure they are free of obstructions and spinning freely. Replace any faulty fan motors.
6

With the refrigerator unplugged, use a multimeter to check the windings of the compressor for continuity. Resistance should be present; an open winding indicates compressor failure.
7

If a refrigerant leak is suspected, consult a certified HVAC technician for leak detection and repair.

Safety Warning:

Disconnect power before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Refrigerators contain high voltage components and refrigerant, posing potential hazards.

Prevention:

Clean the condenser coils every 6 months using a vacuum cleaner with a brush attachment. Ensure proper airflow around the refrigerator.

Expert Tip:

On some Maytag models, you can initiate a forced defrost cycle by pressing and holding the freezer temperature DOWN and refrigerator temperature UP buttons simultaneously for 3 seconds. This can sometimes temporarily alleviate frost buildup issues contributing to compressor strain.

Frequently Asked Questions

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

Typical resistance readings for a Maytag refrigerator compressor windings are between 2-15 ohms, but this can vary by model. Check the service manual for your specific refrigerator.

•How do I test the overload relay on the compressor?

To test the overload relay, unplug the refrigerator and remove the relay from the compressor. Use a multimeter set to continuity to check for continuity across the relay terminals. The relay should have continuity when cold, and open when heated (simulating an overload condition).

•Could over-oiling the condenser fan motor cause the noise?

Yes, over-oiling the condenser fan motor can cause the lubricant to attract dust and debris, potentially leading to noise and premature failure. Use only a few drops of light machine oil if lubrication is required.

Maytag Refrigerator Compressor Hum Louder After Coil Cleaning: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

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

•How do I test the overload relay on the compressor?

•Could over-oiling the condenser fan motor cause the noise?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: