Maytag Refrigerator Compressor Not Starting After Power... | appliancefaults.com

Technical Background:

The refrigerator's main control board (MCU) manages the compressor operation. It receives signals from the thermostat and other sensors, and then sends voltage to the compressor start relay and capacitor (if equipped). A power flicker can cause voltage spikes or surges that damage sensitive electronic components on the MCU or the compressor components themselves. The voltage path consists of 120V AC from the breaker panel to the main control board, then to the compressor start relay, capacitor, and finally to the compressor motor windings.

Symptoms:

The homeowner reports that after a brief power outage, the Maytag refrigerator compressor is no longer starting. The lights inside the refrigerator may still be working, but the refrigerator is not cooling.

Possible Causes:

Damaged compressor start relay or overload.
Faulty compressor capacitor.
Locked rotor compressor.
Failed main control board (MCU).
Tripped breaker or blown fuse in the breaker panel.
Loose wiring connections.

Solution:

1

Unplug the refrigerator or turn off the dedicated breaker in the breaker panel.
2

Locate the compressor compartment, typically at the rear of the refrigerator near the bottom. Remove the access panel using a 1/4-inch nut driver.
3

Inspect the compressor start relay and overload. Look for burn marks or a burnt smell. Test the relay for continuity using a multimeter.
4

Check the compressor capacitor (if equipped). Carefully discharge the capacitor with an insulated screwdriver before handling. Test with a multimeter for capacitance.
5

Test the voltage to the compressor using a multimeter (set to AC Volts). Verify 120V AC at the compressor terminals when the refrigerator is calling for cooling.
6

If voltage is present, but the compressor isn't running, the compressor motor windings may be shorted. Use a multimeter set to Ohms to test resistance between each of the three pins on the compressor. A shorted reading indicates a bad compressor. A normal reading should be between 2-15 Ohms between each terminal.
7

If no voltage is present, suspect a faulty main control board (MCU). Inspect the board for burned components. Replacing the board may be necessary.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Use proper lockout/tagout (LOTO) procedures. High voltage is present in the compressor circuit. Improper handling can result in serious injury or death.

Prevention:

Install a surge protector at the outlet to protect the refrigerator from power surges. Regularly inspect and clean the condenser coils to ensure proper airflow and prevent the compressor from overheating. Consider a UPS (Uninterruptible Power Supply) for critical appliances.

Expert Tip:

Some Maytag refrigerators have a service mode. Simultaneously press and hold the 'Freezer Temp Down' and 'Refrigerator Temp Up' buttons for 5 seconds. This will enter the diagnostic mode where you can manually activate the compressor for testing.

Frequently Asked Questions

•How do I safely discharge a capacitor?

Use an insulated screwdriver with a well-insulated handle. Short the terminals of the capacitor. This will dissipate any stored energy. Even after discharging, be careful when handling capacitors as they can sometimes retain a small charge.

•Where can I find the wiring diagram for my refrigerator?

The wiring diagram is usually located on the back of the refrigerator or inside the control panel. It's often folded and tucked into a plastic sleeve. If you cannot locate it there, you might be able to find it online at the Maytag website or a parts distributor's website by searching for your refrigerator's model number.

•How do I know if my compressor is actually locked up?

A locked rotor compressor will usually draw very high amperage and may trip the breaker. When testing the compressor windings with an ohmmeter, you might find that one or more windings are shorted to ground, or there is infinite resistance, depending on the failure mode.

Maytag Refrigerator Compressor Not Starting After Power Flicker: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I safely discharge a capacitor?

•Where can I find the wiring diagram for my refrigerator?

•How do I know if my compressor is actually locked up?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: