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

Technical Background:

The washer's MCU (Microcontroller Unit) controls the motor based on user selections. When the agitation cycle is initiated, the MCU sends a signal to the motor relay, providing 120V AC power to the motor. The motor rotates, driving the transmission and agitator. Grinding noises often indicate mechanical wear or obstruction in this drivetrain.

Symptoms:

The homeowner observes a loud grinding noise coming from the washer during the agitation cycle. The washer may still agitate, but the noise is concerning and potentially indicative of a mechanical problem.

Possible Causes:

Worn or damaged agitator dogs (pawls).
Foreign object lodged in the agitator or between the tubs.
Failed or failing transmission.
Worn or damaged motor coupling.
Defective motor bearings.

Solution:

1

Unplug the washer from the 120V AC outlet and turn off the water supply.
2

Remove the agitator. Typically, this involves removing a fabric softener dispenser or cap, then unscrewing a bolt or nut (usually a 7/16-inch socket) holding the agitator in place. Inspect the agitator dogs (pawls) for wear or damage. Replace if needed.
3

Visually inspect the space between the inner and outer tubs for any foreign objects. Remove any obstructions.
4

Check the motor coupling. This is located between the motor and the transmission. Access it by removing the washer's cabinet. Inspect the coupling for cracks or wear. Replace if damaged.
5

Test the motor windings for continuity using a multimeter. If there is no continuity replace the motor.
6

If the agitator dogs and motor coupling are fine, suspect a transmission problem. Rebuild or replace the transmission, which requires significant disassembly and expertise.
7

After repairs, plug the washer back in and run a test cycle.

Safety Warning:

Always disconnect power (LOTO - Lock Out Tag Out) to the washer before attempting any repairs. Capacitors can hold a charge even after the unit is unplugged, so discharge them before working on the motor or control board. High voltage is present when the unit is plugged in.

Prevention:

Avoid overloading the washer with excessive laundry. Regularly inspect and clean the area around the agitator to prevent debris buildup. Check the agitator dogs every year and replace them before they become completely rounded.

Expert Tip:

Some Frigidaire washers have a service mode. To access it, rapidly press the start button 3 times within 5 seconds while the washer is in standby. This allows you to run individual components like the motor for diagnostic purposes.

Frequently Asked Questions

•How do I discharge the capacitor?

Use an insulated screwdriver with a resistor inline to short across the capacitor terminals. Exercise extreme caution, as the capacitor can hold a significant electrical charge.

•What is the correct resistance reading for a healthy motor winding?

Typically, a healthy motor winding should read between 3 to 9 ohms. Refer to the washer's service manual for the exact specification.

•How difficult is it to replace the transmission on this model?

Replacing the transmission is a moderately difficult repair. It involves significant disassembly, including removing the cabinet, motor, and tubs. It's recommended for experienced DIYers or professionals.

Frigidaire Washer Motor Grinding Sound During Agitation: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I discharge the capacitor?

•What is the correct resistance reading for a healthy motor winding?

•How difficult is it to replace the transmission on this model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: