Whirlpool Washer Display Blank and Humming Noise:... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) controls all washer functions including the display. The MCU receives power from the wall outlet and distributes it to various components. The MCU uses a low voltage path for control signals and high voltage for motor and pump operation. A blank display indicates a potential problem with the MCU's power supply or the MCU itself. Humming often indicates the motor is receiving power but unable to start.

Symptoms:

The Whirlpool washer's display is completely blank. When the washer is plugged in, it emits a humming noise but does not start a cycle.

Possible Causes:

Power supply issue to the main control board (MCU).
Faulty main control board (MCU).
Wiring harness damage between the power supply and the MCU.
Stuck or failing motor preventing startup; humming could be motor trying to start but unable to.
Door switch malfunction; preventing proper operation and display initialization.

Solution:

1

Disconnect power to the washer at the breaker panel. Verify no voltage present at the outlet using a multimeter.
2

Locate the main control board (MCU), typically behind the control panel or within the cabinet. Remove the access panel using a 1/4-inch nut driver.
3

Inspect the wiring harness connected to the MCU for any signs of damage, such as frayed wires or loose connections.
4

Check the voltage to the MCU using a multimeter. You should measure 120V AC at the power input terminals. If no voltage is present, trace the wiring back to the power source, checking for continuity.
5

If voltage is present, and the wiring is intact, the MCU is likely faulty. Replace the MCU with a new, compatible part.
6

Reconnect power to the washer and test its operation. Observe the display for proper function.
7

If the issue persists after replacing the MCU, investigate the motor and door switch for possible faults.

Safety Warning:

Disconnect power to the appliance before performing any troubleshooting or repairs. Always use proper Lock Out Tag Out (LOTO) procedures. High voltage is present inside the appliance; exercise caution to avoid electric shock.

Prevention:

Regularly inspect the power cord and wiring harness for damage. Avoid overloading the washer. Clean the dispenser drawers to prevent clogs that could strain the system. Ensure proper ventilation to prevent overheating of components.

Expert Tip:

Many Whirlpool washers have a diagnostic mode. To enter, typically press a sequence of buttons such as 'Start', 'Stop', 'Start', 'Stop'. The service manual will give specifics. This mode can reveal error codes not shown on the normal display.

Frequently Asked Questions

•Where is the main control board located on my Whirlpool washer?

The main control board (MCU) is typically located behind the control panel or inside the cabinet, near the top of the machine. Refer to your washer's service manual for the exact location.

•How do I check the door switch on my Whirlpool washer?

You can test the door switch using a multimeter. Disconnect power to the washer. Locate the door switch and disconnect its wiring. Use the multimeter to check for continuity when the door is closed and open. The switch should show continuity when closed and no continuity when open. Replace if faulty.

•What is the part number for a replacement main control board for my Whirlpool washer model?

The part number for the main control board varies depending on your specific Whirlpool washer model. You can find the correct part number by consulting your washer's parts diagram, which is often available on the Whirlpool website or by contacting a parts supplier.

Whirlpool Washer Display Blank and Humming Noise: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the main control board located on my Whirlpool washer?

•How do I check the door switch on my Whirlpool washer?

•What is the part number for a replacement main control board for my Whirlpool washer model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: