Whirlpool Top Load Washer Sensing Light Blinking:... | appliancefaults.com

Technical Background:

The MCU monitors various sensors (lid switch, water level, motor feedback) to determine the state of the washer. A blinking sensing light indicates that the MCU is not receiving the expected signals from one or more of these sensors or has detected an error. Voltage paths relevant to troubleshooting include the 120V AC supply to the MCU, the 5V DC supply to the sensors, and the signal lines between the sensors and the MCU.

Symptoms:

The washer is stuck in the sensing mode. The sensing light is blinking continuously, and the wash cycle will not start.

Possible Causes:

Lid switch failure
Faulty water level sensor/pressure switch
Clogged drain pump or drain hose
Problem with the motor or motor control board
Defective main control board (MCU)

Solution:

1

Unplug the washer from the outlet.
2

Check the lid switch for continuity with a multimeter. Should read closed when the lid is closed, open when open. Replace if faulty.
3

Inspect the drain pump for obstructions. Remove any debris.
4

Check the drain hose for kinks or clogs.
5

Test the water level sensor/pressure switch using a multimeter, follow the manufacturer's test procedure for resistance values. Replace if out of spec.
6

Examine the wiring harness for loose connections or damaged wires. Repair as needed.
7

As a last resort, consider replacing the main control board (MCU).

Safety Warning:

Disconnect power (LOTO) before servicing. High voltage is present inside the washer. Wear appropriate safety gear.

Prevention:

Regularly clean the drain pump filter to prevent clogs. Avoid overloading the washer. Use the correct type and amount of detergent. Periodically inspect hoses for wear and tear.

Expert Tip:

Some Whirlpool washers have a diagnostic mode. To enter it, with the washer unplugged, plug it in, then quickly press and release the START button 6 times within 12 seconds. Observe the error codes displayed by the LEDs.

Follow-up Questions:

Frequently Asked Questions

•How do I access the drain pump to check for clogs?

The drain pump is typically located behind an access panel at the bottom front of the washer. You may need a 1/4-inch nut driver to remove the screws. Disconnect power first. Have a pan ready, as some water may spill.

•What resistance value should I expect from the water level sensor?

The resistance value varies depending on the model. Consult the tech sheet for your specific washer model. Generally, it should read between 2k and 10k ohms depending on water level.

•Where can I find the tech sheet for my Whirlpool washer?

The tech sheet is often located inside the washer cabinet, typically taped to the back panel or inside the control panel. You can also search online using your washer's model number.

Whirlpool Top Load Washer Sensing Light Blinking: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump to check for clogs?

•What resistance value should I expect from the water level sensor?

•Where can I find the tech sheet for my Whirlpool washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: