Whirlpool Refrigerator Clicking Sound: Relay Board... | appliancefaults.com

Technical Background:

The refrigerator's main control unit (MCU) sends a signal to the relay board. The relay board then activates the compressor via the start relay. Voltage fluctuations or a faulty MCU can cause the relay to chatter (click repeatedly). The overload protector is a safety device that trips if the compressor overheats.

Symptoms:

The homeowner observes a repetitive clicking sound coming from the back of the Whirlpool refrigerator. The refrigerator may or may not be cooling properly. The clicking may be intermittent or constant.

Possible Causes:

Failing start relay on the compressor.
Defective overload protector.
Faulty compressor.
Problems with the main control board (MCU) relays.
Voltage fluctuations at the outlet causing relay chatter.
Loose wiring connections on the relay board or compressor.

Solution:

1

Unplug the refrigerator from the outlet. Verify the outlet is supplying 120V AC with a multimeter.
2

Locate the relay board, typically near the compressor. Remove the access panel using a 1/4-inch nut driver.
3

Visually inspect the relay board for burned components, swollen capacitors, or damaged traces.
4

Test the start relay. Use a multimeter to check for continuity across the relay terminals when it's supposed to be closed. A lack of continuity indicates a faulty relay.
5

Test the overload protector for continuity. An open overload protector indicates it has tripped, possibly due to a compressor issue.
6

If the relay or overload protector is faulty, replace it. Ensure the replacement part is compatible with the refrigerator model.
7

If the relay and overload protector test okay, suspect a faulty compressor or main control board. Test the compressor windings for shorts to ground using a multimeter. If the windings are shorted, the compressor is likely failing. If compressor windings are OK, replacement of the main control board is a possible solution if all other tests fail.

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. Use proper Lock-Out Tag-Out (LOTO) procedures. Be aware of high voltage present in the control panel and near the compressor. Wear appropriate safety glasses and gloves.

Prevention:

Periodically clean the condenser coils using a vacuum cleaner with a brush attachment. This improves airflow and reduces compressor workload. Ensure the refrigerator has adequate ventilation. Avoid overloading the refrigerator, as this can strain the compressor. Install a surge protector to protect against voltage spikes.

Expert Tip:

Some Whirlpool refrigerators have a diagnostic mode. Press and hold the freezer and refrigerator temperature DOWN buttons simultaneously for about 5 seconds to enter service mode. Consult the service manual for error codes.

Frequently Asked Questions

•How do I test the compressor windings for a short to ground?

Set your multimeter to the highest resistance setting (e.g., 20M ohms). Place one probe on a compressor terminal and the other on the compressor body (bare metal). A low resistance reading (close to zero) indicates a short to ground.

•Where can I find the correct replacement relay board for my specific Whirlpool refrigerator model?

The part number is located on the board itself. Cross-reference the part number on appliancepartspros.com, searspartsdirect.com, or similar sites. You will need your fridge model number as well to confirm compatibility.

•If the new relay board doesn't fix the clicking, what is the next most likely cause?

If the relay board replacement doesn't solve the issue, the compressor itself is the next most likely cause. However, confirm adequate supply voltage (120V AC) at the wall outlet before replacing the compressor. A weak start winding on the compressor will cause a clicking sound as it attempts to start. Also, verify all the wiring connections from the board to the compressor. A loose connection could be present.

Whirlpool Refrigerator Clicking Sound: Relay Board Replacement or Repair?

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the compressor windings for a short to ground?

•Where can I find the correct replacement relay board for my specific Whirlpool refrigerator model?

•If the new relay board doesn't fix the clicking, what is the next most likely cause?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: