Whirlpool Washer Grinding Noise During Drain Pump:... | appliancefaults.com

Technical Background:

The washing machine's Main Control Unit (MCU) sends a 120V AC signal to the drain pump motor during the drain cycle. This energizes the motor, which spins the impeller to expel water from the tub. The drain pump's operation is monitored by the MCU, and faults can trigger error codes. Voltage readings at the drain pump connector should be verified during the drain cycle to confirm proper operation of the MCU and wiring harness.

Symptoms:

The homeowner reports a loud grinding noise originating from the Whirlpool washing machine specifically during the drain cycle. The washer may still be draining, but the noise is a new development.

Possible Causes:

Foreign object lodged in the drain pump impeller.
Worn or damaged drain pump motor bearings.
Loose drain pump mounting.
Partially blocked drain hose restricting flow.
Defective drain pump motor.
Clogged drain filter.

Solution:

1

Unplug the washing machine from the 120V AC power outlet.
2

Turn off the water supply valves to the washer.
3

Access the drain pump. This is usually located at the bottom front or rear of the machine. Consult your owner's manual for specific location.
4

Disconnect the drain hoses from the pump. Have a pan ready to catch any residual water.
5

Inspect the drain pump impeller for any obstructions (coins, buttons, lint). Remove any foreign objects.
6

Manually rotate the pump impeller. If it feels rough or makes noise, the pump motor bearings may be worn.
7

If the pump appears defective or the grinding noise persists after removing obstructions, replace the drain pump with a new Whirlpool-approved part. Use a 1/4-inch nut driver and a pair of pliers during the replacement.

Safety Warning:

Disconnect power to the appliance before performing any repairs. Lock Out/Tag Out (LOTO) procedures must be followed. High voltage is present when the machine is plugged in. Wear appropriate safety glasses and gloves.

Prevention:

Regularly clean the drain pump filter (if accessible) to remove lint and debris. Check pockets before loading clothes to prevent foreign objects from entering the pump. Use appropriate amount of HE detergent.

Expert Tip:

Some Whirlpool washers have a service mode. Refer to the technical service manual for the specific model. The service mode often includes diagnostic tests, including individual component tests. To enter service mode on some models, press and hold the Start/Pause button while plugging the washer back into the outlet. Release Start/Pause after 5 seconds, then press the following buttons in sequence: Cycle Select, Start/Pause, Cycle Select, Start/Pause.

Frequently Asked Questions

•How do I access the drain pump on my specific Whirlpool washer model?

The drain pump location varies by model. Consult your owner's manual or a service manual. Generally, you'll need to remove either the front or rear access panel, often secured with screws or clips. Some models have a small access door at the bottom front specifically for the drain pump.

•What is the correct replacement drain pump part number for my washer?

To determine the correct part number, you'll need your washer's model number. You can usually find this on a sticker or plate located on the washer frame, often near the door opening or on the back panel. Once you have the model number, you can search for the compatible drain pump online or at a local appliance parts supplier.

•How do I test the drain pump with a multimeter?

After disconnecting the power, disconnect the wires to the pump. Set your multimeter to ohms. Place the probes on the pump terminals. A reading of between 5 and 20 ohms is typical for a functional drain pump. An open circuit (OL) or a very low resistance (close to 0 ohms) indicates a faulty pump.

Whirlpool Washer Grinding Noise During Drain Pump: Repair Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on my specific Whirlpool washer model?

•What is the correct replacement drain pump part number for my washer?

•How do I test the drain pump with a multimeter?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: