Whirlpool Washer Loud Pop During Spin-Down:... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) controls the motor speed via a variable frequency drive. During spin-down, the MCU gradually reduces voltage to the motor windings. Faults can cause sudden stops or voltage spikes, manifesting as mechanical sounds. DC voltage is converted to AC for the motor, creating reactive loads.

Symptoms:

The homeowner reports a loud “pop” sound emanating from the Whirlpool washing machine during the spin-down phase (as the drum slows to a stop).

Possible Causes:

Failed motor coupling.
Worn-out suspension springs or struts.
Object stuck in the drain pump.
Drive belt slippage and snapping back.
Arcing within the motor windings or control board relays.
Sticking brake assembly (if equipped).

Solution:

1

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

Inspect the motor coupling (between motor and transmission) for cracks or breaks. Replace if damaged.
3

Examine the suspension springs and struts for signs of wear, breakage, or detachment. Replace any faulty components. Use a 5/16-inch socket to remove fasteners.
4

Check the drain pump for obstructions. Remove the pump access panel (usually at the front bottom) and clear any debris.
5

Inspect the drive belt for wear, cracks, or looseness. Tension should feel firm. Replace if damaged or excessively worn. A 1/4-inch nut driver may be needed for panel removal.
6

Visually inspect the motor windings and control board for signs of arcing or burning. (For advanced users only). Measure voltage at motor terminals; should drop smoothly during spin down.
7

If equipped with a brake, check for proper release and engagement. Lubricate moving parts with silicone grease.

Safety Warning:

Disconnect power at the breaker panel before servicing. Capacitors in the control board can hold a lethal charge even after the unit is unplugged. Use extreme caution when working with electrical components. Lock Out/Tag Out (LOTO) procedures must be followed.

Prevention:

Regularly check and clean the drain pump filter. Avoid overloading the washer. Inspect suspension components annually. Use appropriate detergent for HE washers.

Expert Tip:

Many Whirlpool washers have a diagnostic mode. Entering service mode allows you to run individual component tests. Consult the tech sheet located inside the washer cabinet for specific instructions on entering service mode and running tests.

Frequently Asked Questions

•How do I access the tech sheet for my Whirlpool washer?

The tech sheet is usually located inside the washer cabinet, often taped to the inside of the front panel or the top panel. You may need to remove a few screws to access it.

•What is the proper tension for the drive belt?

The drive belt should have some give but not be excessively loose. A good rule of thumb is that you should be able to deflect the belt about 1/2 inch in the middle of its longest run.

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

Discharging a capacitor should only be performed by a qualified technician. It involves using a resistor of appropriate value and voltage rating to slowly drain the stored charge. Refer to a schematic and use extreme caution.

Whirlpool Washer Loud Pop During Spin-Down: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the tech sheet for my Whirlpool washer?

•What is the proper tension for the drive belt?

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

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: