Speed Queen Washer Not Finishing Cycle: Troubleshooting... | appliancefaults.com

Technical Background:

The Speed Queen washer's MCU controls the entire wash cycle, activating the water inlet valve, drain pump, and drive motor according to a pre-programmed sequence. The MCU relies on input from sensors like the lid switch and water level pressure switch. Voltage pathways ensure the proper operation of these components. A fault in any of these components or their associated wiring can cause the MCU to halt the cycle.

Symptoms:

The Speed Queen washer starts a cycle but stops before completion. It may get stuck on the wash, rinse, or spin cycle, and the timer does not advance. The washer may display an error code or simply stop without warning.

Possible Causes:

Clogged drain pump filter
Faulty lid switch or lid lock assembly
Defective water level pressure switch
Malfunctioning drive motor or motor control board
Restricted drain hose
Corrupted MCU (Main Control Unit) software

Solution:

1

Unplug the washer from the 120V AC power outlet and turn off the water supply.
2

Check the drain hose for kinks or obstructions. Disconnect the hose and flush it with water.
3

Inspect and clean the drain pump filter. This is usually located behind a small access panel at the front base of the machine. Remove any debris.
4

Test the lid switch continuity using a multimeter. With the lid closed, it should show continuity. If not, replace the switch.
5

Verify the water level pressure switch hose is not kinked or blocked. A blocked hose can give false readings to the MCU.
6

Check the voltage to the drive motor during operation. Use a multimeter to check for 120V AC at the motor terminals when the motor should be running. If voltage is present but the motor is not running, the motor may be defective.
7

If all else fails, consider replacing the MCU, although this is a less common failure.

Safety Warning:

Disconnect power to the appliance before performing any repairs. Use proper Lock Out Tag Out (LOTO) procedures to prevent accidental energization. Be careful when working with electrical components, as 120V AC can cause serious injury.

Prevention:

Regularly clean the drain pump filter every 3 months. Avoid overloading the washer. Use the correct type and amount of detergent. Inspect the drain hose annually for wear or damage.

Expert Tip:

Enter diagnostic mode by pressing and holding the Start/Pause button while simultaneously pressing the Cycle Selector knob three times within 5 seconds. This may display error codes to assist in troubleshooting.

Frequently Asked Questions

•Where is the drain pump filter located on my Speed Queen washer?

The drain pump filter is typically located behind a small access panel at the front, bottom of the machine. You may need a flathead screwdriver to open the panel.

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

Unplug the washer. Locate the lid switch and disconnect the wires. Set your multimeter to continuity testing. Place the probes on the switch terminals and manually close the lid switch. You should get a reading of near zero ohms (continuity) when the switch is closed and an open circuit when open.

•How do I access the MCU to check its wiring and connections?

Accessing the MCU typically involves removing the top panel of the washer. Disconnect power FIRST. Refer to the service manual for your specific model to locate the MCU. Carefully inspect the wiring harness for loose connections or damage. Note the wire locations before disconnecting anything.

Speed Queen Washer Not Finishing Cycle: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the drain pump filter located on my Speed Queen washer?

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

•How do I access the MCU to check its wiring and connections?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: