Whirlpool Duet Washer: Loud Jackhammer Noise During... | appliancefaults.com

Technical Background:

The Duet washer's Main Control Unit (MCU) signals the water inlet valve(s) to open, allowing water to fill the tub. Voltage is supplied through relays on the MCU to the valve solenoids. If the valve closes abruptly or water pressure is too high, the sudden stop of water flow creates pressure waves that cause the pipes to bang.

Symptoms:

The US homeowner observes a loud, repetitive banging or jackhammer-like noise when the Whirlpool Duet washer fills with water. This noise is often described as water hammer.

Possible Causes:

Loose water supply hoses
High water pressure
Faulty water inlet valve
Air in the water lines
Partially blocked water inlet valve screen

Solution:

1

Turn off the water supply valves (hot and cold) to the washer.
2

Inspect water supply hoses for looseness. Tighten connections with adjustable wrench.
3

Check water pressure using a pressure gauge connected to the faucet. Normal pressure is 40-60 PSI. Install a pressure regulator if pressure is too high.
4

Clean the water inlet valve screens. Disconnect hoses from the back of the washer. Use needle-nose pliers to remove the screens. Rinse under water and scrub with a brush.
5

Test the water inlet valve. Reconnect hoses. Start a wash cycle. Listen for a clicking sound from the valve as it opens and closes. If it's noisy or doesn't shut off completely, replace the valve. The valve is typically secured with screws or clips, requiring a 1/4-inch nut driver.
6

Check for proper grounding of the appliance. Use a multimeter to verify continuity from the washer chassis to the ground pin on the power cord plug.
7

Inspect the house plumbing for 'water hammer' arrestors and install if needed.

Safety Warning:

Disconnect power to the washer at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. High voltage is present when the washer is plugged in.

Prevention:

Periodically inspect and tighten water hose connections. Check water pressure annually. Clean inlet valve screens every 6 months. Flush water lines to remove sediment and air.

Expert Tip:

Many Duet washers have a diagnostic mode. Enter the diagnostic mode to run a fill test and observe the water inlet valve operation. To enter the diagnostic mode, consult the technical service manual for the specific model. It often involves pressing a specific sequence of buttons on the control panel.

Frequently Asked Questions

•What is the voltage I should see at the water inlet valve?

You should see 120V AC at the water inlet valve when the washer is in the fill cycle.

•How do I flush the water lines?

Turn off the main water supply. Open the highest and lowest faucets in the house to drain the lines. Then, turn the main supply back on slowly to flush out any sediment.

•Where are water hammer arrestors usually installed?

Water hammer arrestors should be installed as close as possible to the source of the water hammer, ideally near the washing machine connections or at the main water supply line.

Whirlpool Duet Washer: Loud Jackhammer Noise During Water Fill - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the voltage I should see at the water inlet valve?

•How do I flush the water lines?

•Where are water hammer arrestors usually installed?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: