Speed Queen Washer Filling with Water When Off:... | appliancefaults.com

Technical Background:

The Speed Queen washer's water inlet valve is controlled by the Main Control Unit (MCU). The MCU sends a 120V AC signal to the valve to open it and allow water to flow. A defective MCU or a short in the wiring can cause the valve to remain open even when no signal is supposed to be sent. The pressure switch signals the MCU when the tub is full.

Symptoms:

The washer fills with water even when it's turned off and not running a cycle. The water level continues to rise until the tub overflows, potentially causing water damage.

Possible Causes:

Faulty water inlet valve
Defective pressure switch
Siphon effect from drain hose
Malfunctioning main control unit (MCU)
Wiring harness issue shorting the valve circuit

Solution:

1

Disconnect power to the washer at the breaker panel.
2

Inspect the water inlet valve. Check for any visible damage or mineral buildup. Remove the inlet hoses and inspect the valve seats.
3

Test the water inlet valve coils using a multimeter. You should read a resistance value; an open circuit indicates a faulty coil. Typical resistance is between 800-1500 ohms.
4

Check the drain hose system. Ensure it is not inserted too far into the drain pipe, which can cause siphoning. The top of the hose should be higher than the water level in the tub.
5

Inspect the pressure switch and hose. Make sure the hose is securely connected and free of kinks or obstructions. A faulty pressure switch can send incorrect signals to the MCU.
6

Locate the MCU and check the wiring harness connected to the water inlet valve. Look for any signs of damage, corrosion, or loose connections. Use a 1/4-inch nut driver for access. Check for 120V AC at the valve when it is supposed to be OFF, indicating a faulty MCU.
7

If all other components check out, the MCU may be faulty and need replacement.

Safety Warning:

Disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out / Tag Out (LOTO) procedures should be followed to prevent accidental re-energizing of the circuit. High voltage is present in the washer's control circuits.

Prevention:

Periodically inspect the water inlet hoses for cracks or leaks. Clean the water inlet valve screens to prevent mineral buildup. Ensure the drain hose is properly installed and not causing a siphon. Check the air dome on the pressure switch line for clogs.

Expert Tip:

Speed Queen washers have a diagnostic mode. Press and hold the Cycle Selector and Start buttons simultaneously for 5 seconds to enter the service mode. This allows you to test individual components like the water inlet valve.

Frequently Asked Questions

•What is the part number for the water inlet valve on my specific Speed Queen model?

You will need to locate the model and serial number of your Speed Queen washer, typically found on a sticker inside the door or on the back of the machine. Once you have that information, you can search for the correct water inlet valve part number online using appliance parts retailers or by contacting Speed Queen directly.

•How do I test the pressure switch to see if it's working correctly?

Disconnect the pressure switch hose. Use a multimeter set to continuity. With the hose disconnected, blow into the pressure switch. You should hear a click, and the multimeter should show continuity between the appropriate terminals. Consult the wiring diagram for your model to identify the correct terminals.

•Where is the MCU located in my Speed Queen washer?

The MCU is typically located behind the control panel at the top of the washer. You will need to remove the control panel to access it. Be careful when removing the control panel, as there may be wires connected to it.

Speed Queen Washer Filling with Water When Off: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the part number for the water inlet valve on my specific Speed Queen model?

•How do I test the pressure switch to see if it's working correctly?

•Where is the MCU located in my Speed Queen washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: