Whirlpool Refrigerator Clicking Sound Every 30 Seconds:... | appliancefaults.com

Technical Background:

The main control unit (MCU) sends a signal to the compressor relay to energize the compressor motor. If the compressor has difficulty starting, or if there is a fault in the compressor circuit, the relay can repeatedly attempt to start the compressor, resulting in a clicking sound. The voltage path includes the breaker panel, outlet, power cord, MCU, relay/overload, and compressor windings.

Symptoms:

The homeowner reports a clicking sound originating from the back of the refrigerator, occurring approximately every 30 seconds. The refrigerator may not be cooling properly, or not cooling at all.

Possible Causes:

Faulty compressor relay/overload.
Compressor hard starting or locked rotor.
Low voltage to the refrigerator.
Defective start capacitor (if equipped).
Malfunctioning main control board (MCU).
Wiring issues affecting compressor circuit.

Solution:

1

Unplug the refrigerator from the outlet. Verify outlet voltage is 120V AC using a multimeter.
2

Locate the compressor relay/overload, typically mounted on the compressor housing. This is often near the bottom rear of the unit.
3

Disconnect the wires from the relay/overload. Inspect for burnt or loose connections. Use a 1/4-inch nut driver or 5/16-inch socket as needed.
4

Test the relay using a multimeter for continuity. A lack of continuity indicates a faulty relay. Replace if necessary. A typical relay should show continuity when energized (check relay specs).
5

Check the compressor windings for shorts to ground using a multimeter. Resistance should be high (megohms) between each terminal and the compressor housing.
6

If a start capacitor is present, discharge it with a resistor and test for capacitance using a multimeter. Replace if out of spec.
7

Reconnect all wires securely. Plug the refrigerator back in and monitor compressor operation.

Safety Warning:

Disconnect power to the refrigerator at the breaker panel before performing any repairs (Lock Out/Tag Out - LOTO procedure). High voltage is present in the compressor circuit.

Prevention:

Periodically clean the condenser coils (located at the back or bottom of the refrigerator) to ensure proper heat dissipation and reduce compressor strain. Ensure adequate ventilation around the refrigerator.

Expert Tip:

Some Whirlpool refrigerators have a diagnostic service mode. To enter, press and hold the freezer and refrigerator temperature down buttons simultaneously for approximately 5 seconds. This may display error codes to assist in diagnosis.

Frequently Asked Questions

•How do I test the compressor windings?

Using a multimeter set to ohms, measure the resistance between each of the three compressor terminals. Then, measure the resistance between each terminal and the compressor housing (ground). The terminal readings should be low (a few ohms), and the ground readings should be very high (megohms).

•What is the correct start capacitor value for my refrigerator?

The start capacitor value is typically printed on the capacitor itself, usually in microfarads (uF). Consult the refrigerator's service manual or parts diagram for the correct replacement value.

•How do I determine if the main control board (MCU) is faulty?

Testing the MCU requires advanced troubleshooting skills. First, confirm all other components are functioning correctly. Then, verify that the MCU is sending the correct voltage signal to the compressor relay when the compressor is supposed to be running. If the MCU is not sending the signal, and all other components are good, the MCU is likely faulty.

Whirlpool Refrigerator Clicking Sound Every 30 Seconds: Compressor Relay Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the compressor windings?

•What is the correct start capacitor value for my refrigerator?

•How do I determine if the main control board (MCU) is faulty?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: