Whirlpool Top Load Washer Sensing Too Long, Then... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) relies on feedback from the pressure switch/sensor to determine the water level. If the MCU doesn't receive the correct signal, it continues to 'sense'. If the MCU detects an issue during sensing, such as overfilling or a drain issue, it may trigger the drain pump and end the cycle. Voltage paths to the drain pump and pressure switch must be intact for proper operation.

Symptoms:

The Whirlpool top load washer fills partially, then continues 'sensing' for over 10 minutes. After this extended sensing phase, the washer drains all the water without ever agitating or washing the clothes. The cycle ends prematurely.

Possible Causes:

Faulty pressure switch/sensor.
Clogged drain hose or drain pump.
Defective drain pump.
Problem with the motor control unit (MCU).
Obstruction in the tub or impeller area.
Air lock in the drain system.

Solution:

1

Unplug the washer from the outlet. Lock Out/Tag Out (LOTO) procedure.
2

Inspect the pressure switch hose for kinks or clogs. Remove and blow through it. Use a 5/16-inch nut driver to remove the cabinet if needed.
3

Check the drain hose for obstructions. Disconnect it from the drain standpipe.
4

Access the drain pump (usually at the bottom front or rear). Check for debris. A 1/4-inch nut driver may be required.
5

Use a multimeter to test the drain pump for continuity (should read a resistance value). Typically around 10-20 Ohms.
6

Check the voltage to the drain pump during the sensing phase (should be 120V AC if activated). Use caution when testing live voltage.
7

Inspect the wiring harness and connections to the pressure switch, drain pump, and MCU for damage.

Safety Warning:

Disconnect power to the washer before performing any repairs. High voltage is present inside the appliance. Lock Out/Tag Out (LOTO) procedures should always be followed.

Prevention:

Periodically clean the drain pump filter (if accessible) to prevent clogs. Avoid overloading the washer with clothes. Use the correct amount of detergent.

Expert Tip:

Many Whirlpool washers have a diagnostic mode. To access it, rapidly press the start button 3 times within 5 seconds, then press power. This may reveal error codes beyond the standard flashing lights.

Frequently Asked Questions

•What is the part number for the pressure switch on this model?

You'll need the model number of the washer to find the exact part number. Look on the appliance itself. Once you have the model number, you can use an online parts retailer to find the correct pressure switch.

•How do I test the pressure switch with a multimeter?

Disconnect the pressure switch. Set your multimeter to measure resistance (Ohms). With the tub empty, measure the resistance between the common terminal and the normally open terminal. It should read open (OL). When you gently blow into the pressure switch hose connection, the switch should close, and the meter should read near zero Ohms.

•Where is the MCU located in this Whirlpool washer?

The MCU is typically located behind the control panel at the top of the washer. You will likely need to remove the control panel to access it. Be careful when disconnecting the wiring harness from the MCU.

Whirlpool Top Load Washer Sensing Too Long, Then Draining: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the part number for the pressure switch on this model?

•How do I test the pressure switch with a multimeter?

•Where is the MCU located in this Whirlpool washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: