Whirlpool Refrigerator: Clicking Sound & Water Valve... | appliancefaults.com

Technical Background:

The main control unit (MCU) sends a 120V AC signal to the water inlet valve solenoid when the icemaker or water dispenser is activated. A relay on the MCU board controls this voltage. If the relay is failing or the solenoid is shorted, the MCU may repeatedly attempt to activate the valve, resulting in a clicking sound. A low resistance in the solenoid coil can also cause the MCU to shut down the voltage to protect itself.

Symptoms:

The US homeowner reports a clicking sound coming from the back of the Whirlpool refrigerator, accompanied by suspicion about the back water valve solenoid resistance.

Possible Causes:

Faulty water inlet valve solenoid
Low water pressure to the refrigerator
Defective main control board (MCU) relay
Wiring harness issue affecting solenoid voltage
Icemaker module malfunction
Blocked water filter

Solution:

1

Unplug the refrigerator from the outlet or turn off the breaker.
2

Access the water inlet valve, usually located at the back of the refrigerator near the bottom.
3

Using a multimeter, measure the resistance of the water valve solenoid coil. A normal reading is typically between 200-500 ohms. An open circuit indicates a faulty solenoid.
4

Check the water pressure to the refrigerator. It should be at least 20 PSI. Low pressure can prevent the valve from opening fully.
5

Inspect the wiring harness connected to the water valve for any signs of damage, such as frayed wires or loose connections. Use a 1/4-inch nut driver to tighten connections if necessary.
6

If the solenoid resistance is within range and water pressure is adequate, suspect a faulty main control board (MCU). The relay that controls the water valve may be failing. Replacement of the MCU may be required.
7

Replace the water filter. A clogged filter restricts flow and can cause valve issues.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. High voltage is present in the appliance.

Prevention:

Replace the water filter every 6 months. Periodically check the water pressure to the refrigerator. Inspect the wiring harness for any signs of damage during routine maintenance.

Expert Tip:

Many Whirlpool refrigerators have a diagnostic mode. Simultaneously press and hold the 'Freezer Temp Down' and 'Refrigerator Temp Up' buttons for 3 seconds to enter the service mode. This will display error codes and allow you to run diagnostic tests.

Frequently Asked Questions

•What is the typical lifespan of a Whirlpool refrigerator water inlet valve?

A typical water inlet valve lasts approximately 5-10 years, depending on water quality and usage.

•How do I test the MCU relay without replacing the entire board?

Testing the relay requires advanced electronics knowledge. You would need to isolate the relay on the board and use a multimeter to test its continuity and voltage switching when the water valve is activated. This is best left to a qualified technician.

•Where can I find the correct replacement water inlet valve for my specific Whirlpool refrigerator model?

You can find the correct replacement water inlet valve by searching online appliance parts retailers using your refrigerator's model number. Also, check the manufacturer's website or local appliance parts stores.

Whirlpool Refrigerator: Clicking Sound & Water Valve Solenoid Resistance Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical lifespan of a Whirlpool refrigerator water inlet valve?

•How do I test the MCU relay without replacing the entire board?

•Where can I find the correct replacement water inlet valve for my specific Whirlpool refrigerator model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: