Amana Refrigerator: Loud Buzzing Noise from Evaporator... | appliancefaults.com

Technical Background:

The evaporator fan motor is controlled by the Main Control Unit (MCU). The MCU sends a 12V DC signal to the fan motor to regulate the fan speed. The voltage path includes wiring harnesses and connectors. Malfunctions can cause erratic fan operation or failure. Thermistors in the freezer send feedback to the MCU.

Symptoms:

The Amana refrigerator evaporator fan is making a loud buzzing noise in the freezer compartment. The noise may be intermittent or constant.

Possible Causes:

Ice buildup obstructing the fan blades.
Worn evaporator fan motor bearings.
Debris lodged in the fan assembly.
Loose fan blade on the motor shaft.
Faulty evaporator fan motor winding.
Damaged fan blade.

Solution:

1

Disconnect the refrigerator from the power source. Locate the breaker in the breaker panel and switch it off. Verify no voltage with a multimeter.
2

Remove the freezer back panel (typically using a 1/4-inch nut driver). Note the location of all screws.
3

Inspect the evaporator fan for ice buildup. If present, manually defrost the evaporator coil with a heat gun or hairdryer. Ensure the drain tube is clear.
4

Check for any debris obstructing the fan blades. Remove any obstructions.
5

Manually rotate the fan blade. If it feels rough or noisy, the motor bearings are likely worn.
6

Using a multimeter, test the evaporator fan motor winding for continuity. A lack of continuity indicates a faulty motor.
7

If the motor is faulty, replace it with a new Amana evaporator fan motor. Ensure the new fan blade is properly secured.

Safety Warning:

Always disconnect the refrigerator from the power source before performing any repairs. Use Lock Out Tag Out (LOTO) procedures to ensure the refrigerator remains de-energized. High voltage components are present. Improper handling can result in electric shock.

Prevention:

Regularly defrost the freezer to prevent ice buildup. Ensure the door seals are clean and intact to prevent air leaks. Clean the condenser coils every 6 months to ensure efficient operation.

Expert Tip:

Sometimes a slight adjustment of the fan blade on the motor shaft can eliminate minor buzzing. After system, run the fridge through a full defrost cycle, then hold the door switch down to force the fan on. If it still buzzes, replace the motor.

Frequently Asked Questions

•What is the voltage reading I should expect at the evaporator fan motor connector?

You should expect to see approximately 12V DC at the evaporator fan motor connector when the fan is supposed to be running.

•How do I clear the drain tube if it's clogged?

You can use a turkey baster filled with hot water to flush out the drain tube. Alternatively, a flexible wire or pipe cleaner can be used to dislodge the blockage. Ensure you don't damage the drain tube.

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

You can find replacement parts at most appliance parts retailers, both online and in brick-and-mortar stores. You will need to provide your refrigerator's model number to ensure you get the correct part. Cross-reference the part number on the old motor if possible.

Amana Refrigerator: Loud Buzzing Noise from Evaporator Fan - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the voltage reading I should expect at the evaporator fan motor connector?

•How do I clear the drain tube if it's clogged?

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

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: