Hotpoint Washer Motor Grinding Sound During Agitation:... | appliancefaults.com

Technical Background:

The Motor Control Unit (MCU) sends 120V AC to the motor windings to initiate agitation. The motor spins, driving the transmission to move the agitator. A mechanical coupler connects the motor to the transmission. The transmission contains gears and bearings. If these components fail, grinding sounds are likely. Tub bearings support the inner tub assembly. Failure of these bearings introduces noise due to friction.

Symptoms:

The homeowner reports a loud grinding or scraping sound occurring only during the agitation portion of the wash cycle. The washer may still operate, but the noise is significant.

Possible Causes:

Worn or damaged motor coupler
Worn or seized transmission
Tub bearing failure
Foreign object lodged between the tubs
Defective motor windings

Solution:

1

Unplug the washer from the 120V AC outlet. Always Lock-Out/Tag-Out (LOTO).
2

Remove the cabinet to access the motor and transmission assembly. Use a 1/4-inch nut driver.
3

Inspect the motor coupler for cracks or damage. Replace if necessary.
4

Disconnect the motor from the transmission. Manually rotate the transmission input shaft. If it's difficult to turn or makes noise, the transmission is likely failing.
5

Check for play or excessive movement in the inner tub. If present, the tub bearing may be failing. This requires a more involved repair.
6

Inspect between the inner and outer tubs for any foreign objects causing the grinding. You may need to remove the inner tub for full access.
7

Use a multimeter to check the motor windings for continuity. Resistance should be within the manufacturer's specifications. An open winding indicates a defective motor.

Safety Warning:

Disconnect power to the washer at the breaker panel before performing any repairs. Capacitors in the motor circuit can hold a dangerous charge even after the unit is unplugged. Use caution and discharge capacitors if necessary.

Prevention:

Avoid overloading the washer. Regularly clean the lint filter. Inspect the motor coupler annually for wear. Use the correct type and amount of detergent.

Expert Tip:

On some Hotpoint models, entering service mode by pressing and holding the start button for 5 seconds will initiate a self-diagnostic test. Observe the error codes displayed for additional troubleshooting clues.

Frequently Asked Questions

•What is the resistance range I should expect from a healthy motor winding on this specific Hotpoint model?

Refer to the manufacturer's service manual for the specific resistance range. Typically, it's between 3-6 ohms, but can vary.

•How do I safely discharge a capacitor on the motor control board?

Use a resistor (around 10k ohm, 5 watt) with insulated leads to short across the capacitor terminals. Verify with a multimeter that the voltage has dropped to zero before touching the capacitor.

•What type of grease is recommended for lubricating the transmission if I rebuild it?

Use a high-quality, high-temperature lithium grease specifically designed for gearboxes. Avoid using general-purpose grease.

Hotpoint Washer Motor Grinding Sound During Agitation: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance range I should expect from a healthy motor winding on this specific Hotpoint model?

•How do I safely discharge a capacitor on the motor control board?

•What type of grease is recommended for lubricating the transmission if I rebuild it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: