Whirlpool Refrigerator Evaporator Fan Hitting Back... | appliancefaults.com

Technical Background:

The evaporator fan motor is controlled by the main control unit (MCU), receiving 12V DC. The MCU monitors temperature sensors and cycles the fan on and off to maintain optimal cooling. Voltage is supplied from the power supply board to the MCU and then routed to the fan motor. A thermistor near the evaporator coil provides temperature feedback to the MCU.

Symptoms:

The refrigerator is making a loud buzzing, clicking, or scraping noise coming from the freezer compartment. The noise seems to be emanating from the back wall inside the freezer. The refrigerator may also not be cooling efficiently.

Possible Causes:

Ice buildup around the fan blade or motor.
Warped or loose back cover.
Faulty evaporator fan motor bearings.
Incorrect fan blade system (if recently replaced).
Debris lodged behind the fan or cover.
Damaged or missing fan blade.

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

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

Inspect for ice buildup. If present, manually defrost with a hair dryer (on low) or allow to defrost naturally for several hours. Use a plastic scraper to gently remove ice.
4

Check the fan blade for damage or obstruction. Remove any debris.
5

Ensure the fan blade is securely attached to the motor shaft. If loose, tighten or replace.
6

Inspect the back cover for warping or loose screws. Tighten screws or replace the cover if warped.
7

If the fan motor bearings are suspected to be faulty (noisy or not spinning freely), replace the evaporator fan motor.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures to prevent accidental energizing of the circuit. Be aware of high voltage components within the refrigerator. Wear appropriate safety gear, including gloves and eye protection.

Prevention:

Periodically check the freezer for excessive ice buildup. Ensure the refrigerator door seals are clean and intact. Avoid overpacking the freezer, which can restrict airflow and contribute to ice formation.

Expert Tip:

Many Whirlpool refrigerators have a service diagnostic mode. To access it, simultaneously press and hold the freezer temperature DOWN and refrigerator temperature UP buttons for 3 seconds. This allows you to manually cycle components, including the evaporator fan motor, for testing.

Frequently Asked Questions

•How do I test the evaporator fan motor with a multimeter?

Disconnect the fan motor connector. Set your multimeter to Ohms. Check for continuity across the motor terminals. An open circuit indicates a faulty motor. Consult the service manual for the specific resistance value.

•What causes excessive ice buildup in the freezer?

Common causes include a faulty door seal, frequent door openings, a malfunctioning defrost system (defrost heater, defrost thermostat, or defrost control board), and overpacking the freezer.

•Where can I find the correct replacement evaporator fan motor for my Whirlpool refrigerator model?

You can typically find the correct part number in the refrigerator's service manual or on a sticker inside the refrigerator. You can then order the part from appliance parts suppliers online or at local appliance repair stores.

Whirlpool Refrigerator Evaporator Fan Hitting Back Cover: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the evaporator fan motor with a multimeter?

•What causes excessive ice buildup in the freezer?

•Where can I find the correct replacement evaporator fan motor for my Whirlpool refrigerator model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: