Whirlpool Refrigerator Evaporator Fan Motor Clicking:... | appliancefaults.com

Technical Background:

The evaporator fan motor circulates cold air from the evaporator coils throughout the freezer and refrigerator compartments. The MCU (Main Control Unit) regulates the voltage supplied to the fan motor, typically 12V DC. A thermistor monitors temperature, signaling the MCU to adjust fan speed. Blocked airflow or a failing motor will cause temperature fluctuations.

Symptoms:

The homeowner reports a clicking sound coming from inside the freezer compartment of their Whirlpool refrigerator. The noise seems to originate from the area where the evaporator fan motor is located.

Possible Causes:

Ice buildup obstructing the fan blades.
Debris caught in the fan assembly.
Worn evaporator fan motor bearings.
Faulty evaporator fan motor.
Defective defrost system causing excessive ice accumulation.
Loose fan blade on the motor shaft.

Solution:

1

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

Remove the evaporator cover inside the freezer compartment using a 1/4-inch nut driver.
3

Inspect the evaporator fan for ice buildup or debris. If ice is present, manually defrost with a hair dryer (low setting) or allow the refrigerator to defrost unplugged for several hours.
4

Check the fan blades for obstructions and remove any debris.
5

Once defrosted and clear of debris, rotate the fan blade by hand. If it feels rough or makes noise, the motor bearings may be worn.
6

Use a multimeter to test the evaporator fan motor windings for continuity. Disconnect the motor wires and check the resistance according to the service manual specifications. An open winding indicates a faulty motor.
7

If the motor is faulty, replace it with a new evaporator fan motor. Reassemble the evaporator cover and plug the refrigerator back in. Monitor the operation.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Use Lock Out Tag Out (LOTO) procedures to ensure the unit remains de-energized. Some components operate at 120V AC, posing a shock hazard.

Prevention:

Regularly inspect the freezer for ice buildup. Ensure the door seals are clean and tight to prevent air leaks. Schedule a defrost cycle periodically, even if the refrigerator is frost-free.

Expert Tip:

Many Whirlpool refrigerators have a service mode accessible through the control panel. Consult the service manual for the specific button sequence to access diagnostic tests, including a forced defrost cycle. This can help pinpoint defrost system issues.

Frequently Asked Questions

•What is the typical resistance value for a functioning evaporator fan motor?

The typical resistance value for a Whirlpool evaporator fan motor winding is usually between 50-200 ohms. Refer to the specific service manual for your refrigerator model for the exact specifications.

•How do I test the defrost heater?

To test the defrost heater, unplug the refrigerator and access the heater (usually located near the evaporator coils). Use a multimeter to measure the resistance across the heater terminals. A reading of approximately 20-50 ohms typically indicates a functioning heater. An open circuit indicates a faulty heater.

•What are the common causes of excessive ice buildup in the freezer?

Common causes of excessive ice buildup include faulty door seals, frequent door openings, a malfunctioning defrost timer or defrost thermostat, or a clogged defrost drain. Also check for proper freezer temperature, which should be around 0 degrees Fahrenheit.

Whirlpool Refrigerator Evaporator Fan Motor Clicking: Troubleshooting & Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance value for a functioning evaporator fan motor?

•How do I test the defrost heater?

•What are the common causes of excessive ice buildup in the freezer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: