Speed Queen Washer: Buzzing Noise from Water Inlet... | appliancefaults.com

Technical Background:

The MCU controls the water inlet valves by sending a 120V AC signal to the valve coils. When energized, the coils open the valves, allowing water to flow into the washer. If the voltage is insufficient or the valve is partially blocked, the valve can buzz. The MCU uses triacs or relays to switch the voltage to the valves.

Symptoms:

The Speed Queen washer is making a buzzing noise during the fill cycle. The water may fill slowly or not at all. The buzzing sound is coming from the area of the water inlet valves.

Possible Causes:

Low water pressure
Partially blocked water inlet valve screens
Faulty water inlet valve coil(s)
Loose wiring connections to the water inlet valve
Defective MCU (Main Control Unit) triac/relay
Air trapped in the water lines

Solution:

1

Turn off the power to the washer at the breaker panel.
2

Turn off the water supply valves to the washer.
3

Disconnect the water supply hoses from the water inlet valves. Inspect the inlet valve screens for debris and clean if necessary.
4

Use a multimeter to test the voltage at the water inlet valve terminals during the fill cycle. You should measure approximately 120V AC. If no voltage is present, check the wiring and the MCU.
5

Measure the resistance of the water inlet valve coils with a multimeter. A typical reading is between 500 and 1500 ohms. Replace the valve if the coil is open or shorted.
6

Check all wiring connections to the water inlet valves and the MCU for looseness or corrosion. Repair or replace as needed.
7

If all other components test good, the MCU may be defective and need to be replaced.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed to ensure the appliance cannot be accidentally energized during service. 120V AC is present in the control circuit. Avoid contact with live electrical components.

Prevention:

Periodically check and clean the water inlet valve screens. Ensure adequate water pressure (typically between 20 and 100 PSI). Inspect water supply hoses for kinks or damage. Replace hoses every 5 years.

Expert Tip:

Many Speed Queen washers have a service mode. Consult the service manual for your specific model to access diagnostic tests, including water valve activation tests. This can help isolate the problem valve quickly.

Frequently Asked Questions

•How do I access the service mode on my Speed Queen washer?

The service mode access varies depending on the model. Typically, it involves a specific sequence of button presses on the control panel. Refer to your washer's service manual or search online for the specific sequence for your model.

•What is the proper way to measure the resistance of the water inlet valve coils?

Disconnect the power to the washer and disconnect the wires from the water inlet valve. Set your multimeter to the ohms (Ω) setting. Place one probe on each terminal of the coil. The reading should be within the specified range (typically 500-1500 ohms). An open circuit (infinite resistance) or a short circuit (very low resistance) indicates a faulty coil.

•Where is the MCU (Main Control Unit) located in my Speed Queen washer?

The MCU is typically located behind the control panel. You will need to remove the control panel to access it. Refer to your service manual or online resources for detailed instructions on how to remove the control panel safely.

Speed Queen Washer: Buzzing Noise from Water Inlet Valves - Diagnosis & Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the service mode on my Speed Queen washer?

•What is the proper way to measure the resistance of the water inlet valve coils?

•Where is the MCU (Main Control Unit) located in my Speed Queen washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: