Admiral Dryer Thumping Noise: Troubleshooting Guide -... | appliancefaults.com

Technical Background:

The dryer's Main Control Unit (MCU) regulates motor speed and heating element cycles. Voltage paths control drum rotation and blower operation. The motor typically runs on 120V AC, reversing polarity for auto-dry features. Sensors monitor temperature and moisture levels, reporting back to the MCU.

Symptoms:

The Admiral dryer is producing a rhythmic thumping or bumping sound, even when the drum is empty. The noise occurs during operation and may become louder over time.

Possible Causes:

Worn drum rollers causing the drum to bounce.
A deformed or damaged blower wheel.
A loose or broken drive belt slapping against the cabinet.
Foreign object trapped inside the blower housing or drum.
A warped or bent dryer drum.

Solution:

1

Disconnect power to the dryer at the breaker panel. Lock Out/Tag Out (LOTO) the breaker.
2

Remove the lint filter and inspect for obstructions. Use a flashlight to check the blower housing.
3

Remove the dryer's front panel. This usually requires a 1/4-inch nut driver. Disconnect the door switch wiring.
4

Inspect the drum rollers for wear, flat spots, or damage. Spin the drum manually to observe roller function. Replace rollers as needed. Check roller axles for play.
5

Examine the drive belt for cracks, fraying, or looseness. Replace if damaged. Correct belt alignment. Proper belt tension allows approximately 1/2 inch deflection.
6

Access the blower wheel. Remove any debris. Check for cracks or warping. Secure the blower wheel to the motor shaft. Use a 5/16-inch socket to tighten the retaining screw.
7

Reassemble the dryer, ensuring all components are securely fastened. Restore power and test.

Safety Warning:

Disconnect power to the dryer before any repairs. Capacitors can store lethal voltage even after disconnection. Wear safety glasses and gloves. Lock Out/Tag Out the breaker.

Prevention:

Regularly clean the lint filter after each load. Periodically inspect and clean the blower housing. Annually inspect the drum rollers and drive belt for wear.

Expert Tip:

A common cause of thumping is a worn support roller on the rear of the drum. Try lubricating the rollers with high-temperature grease (sparingly) as a temporary fix to isolate the source before replacing parts. To enter service mode, press and hold the Start button for 5 seconds (may vary by model).

Frequently Asked Questions

•How do I check the drum rollers for wear?

Visually inspect the rollers for flat spots, cracks, or excessive wear. Spin the drum manually and observe the rollers' rotation. If they are not perfectly round or are making noise, they should be replaced.

•What is the proper tension for the drive belt?

The drive belt should have about 1/2 inch of deflection when pressed midway between the pulleys. If it's too loose, the drum won't turn properly. If it's too tight, it will wear out the motor and other components.

•How do I access the blower wheel to check for obstructions?

After removing the front panel, you'll typically find the blower housing connected to the dryer's motor. You'll need to detach the housing (usually held by screws or clips) to access the blower wheel. Ensure the dryer is unplugged before doing so.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I check the drum rollers for wear?

•What is the proper tension for the drive belt?

•How do I access the blower wheel to check for obstructions?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: