Whirlpool Refrigerator Evaporator Fan Not Blowing Air:... | appliancefaults.com

Technical Background:

The electronic control board (ECB) monitors temperatures via thermistors. When the fridge compartment is above its setpoint, the ECB sends a 12V DC signal to the evaporator fan motor. The evaporator fan circulates cold air from the freezer, across the evaporator coils, and into the refrigerator. The door switch signals the ECB to stop the fan when the refrigerator door is opened.

Symptoms:

The refrigerator compartment is warm, while the freezer compartment may still be cold. You might hear the compressor running, but no air circulating within the refrigerator. Food in the fridge spoils quickly.

Possible Causes:

Fan motor failure
Ice buildup obstructing the fan blade
Damaged wiring harness or connections
Defective electronic control board (ECB)
Faulty thermistor (temperature sensor)
Door switch malfunction

Solution:

1

Unplug the refrigerator or turn off the breaker.
2

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

Inspect for ice buildup around the evaporator fan. Defrost with a hair dryer on low setting, being careful not to melt plastic components.
4

Check the fan blade for free rotation. If obstructed, clear any debris.
5

Using a multimeter, test the fan motor windings for continuity. A lack of continuity indicates a failed motor.
6

Check the wiring harness and connections to the fan motor for damage or loose connections. Repair or replace as needed.
7

If the fan motor receives 12V DC (check with multimeter), but does not run, replace the fan motor.

Safety Warning:

Disconnect power to the refrigerator at the breaker panel before attempting any repairs. This prevents electrical shock. Be cautious when using a hair dryer to defrost, as excessive heat can damage plastic components. Wear safety glasses.

Prevention:

Periodically inspect the evaporator fan area for ice buildup. Ensure the refrigerator doors seal properly to prevent excessive moisture from entering. Clean the condenser coils located at the rear or bottom of the refrigerator every 6 months to improve cooling efficiency.

Expert Tip:

Some Whirlpool refrigerators have a service mode. Access it by pressing certain button combinations (refer to the service manual for your specific model). The service mode often allows you to manually activate the evaporator fan to test its functionality.

Follow-up Questions:

Frequently Asked Questions

•How do I test the door switch?

Unplug the refrigerator. Locate the door switch. Use a multimeter set to continuity. With the switch plunger extended (door open), the multimeter should show open circuit. With the plunger depressed (door closed), the multimeter should show continuity.

•Where is the thermistor located and how do I test it?

The thermistor is usually located near the evaporator coil. Unplug the refrigerator. Disconnect the thermistor and measure its resistance with a multimeter. Compare the resistance value to the temperature/resistance chart for your model (available in the service manual). An incorrect resistance indicates a faulty thermistor.

•How do I access and test the electronic control board (ECB)?

The ECB is typically located at the rear of the refrigerator. Unplug the refrigerator. Remove the access panel. Visually inspect the board for any signs of damage (burnt components, bulging capacitors). Testing the ECB requires advanced troubleshooting skills and a wiring diagram. Consider contacting a qualified appliance technician.

Whirlpool Refrigerator Evaporator Fan Not Blowing Air: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the door switch?

•Where is the thermistor located and how do I test it?

•How do I access and test the electronic control board (ECB)?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: