Kenmore 90 Series Washer Overfilling: Troubleshooting... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) controls the water inlet valves based on signals from the pressure switch. The pressure switch senses the water level inside the tub and sends a signal to the MCU. The MCU then energizes or de-energizes the water inlet valves to control the water flow. Voltage is typically 120V AC to the water inlet valves. A faulty pressure switch, hose or a stuck relay on the MCU can all cause overfilling.

Symptoms:

The Kenmore 90 Series washer fills with water past the expected level, resulting in water overflowing from the tub. This may happen during any fill cycle.

Possible Causes:

Faulty water inlet valve(s) stuck open.
Defective pressure switch failing to signal correct water level.
Clogged pressure hose restricting pressure switch operation.
Malfunctioning Main Control Unit (MCU) not shutting off water inlet valves.
Siphon effect due to drain hose improperly positioned.
Damaged or leaking tub causing overfilling to compensate.

Solution:

1

Unplug the washer from the outlet.
2

Turn off the water supply valves (hot and cold) to the washer.
3

Inspect the water inlet valve(s) for leaks or physical damage. Test with a multimeter for continuity when no power is applied. Should read open. Replace if faulty.
4

Check the pressure switch and hose. Disconnect the hose from the pressure switch and blow through it to check for clogs or leaks. Replace if damaged.
5

Using a multimeter, verify the pressure switch signals the MCU correctly as water fills (continuity changes). Refer to wiring diagram.
6

Inspect the drain hose for proper height. The end of the drain hose should be higher than the water level in the tub to prevent siphoning. Secure properly.
7

If the above steps do not resolve the issue, the MCU may be faulty and require replacement or further diagnostics by a qualified technician.

Safety Warning:

Disconnect power to the appliance before performing any repairs. Electrical shock hazard exists. Use Lock-Out/Tag-Out (LOTO) procedures. Capacitors may hold a charge even after disconnection.

Prevention:

Regularly inspect the water inlet hoses for cracks or leaks. Clean the pressure hose annually to prevent clogs. Periodically check the drain hose for proper positioning.

Expert Tip:

A common issue is mineral buildup in the water inlet valve. Try disassembling and cleaning the valve before replacing it. Often a 1/4-inch nut driver can be used to remove the valve housing.

Frequently Asked Questions

•What is the correct resistance reading for the water inlet valve solenoid when it's functioning correctly?

The resistance should typically be between 500 ohms and 1500 ohms. Refer to the service manual for the exact specification for your model.

•How do I access the diagnostic mode on my Kenmore 90 Series washer to check for error codes?

The diagnostic mode access varies by sub-model. A common sequence involves pressing and holding a combination of buttons (e.g., Start/Pause and one other button) for several seconds. Consult the service manual or search online for the specific sequence for your model.

•Where can I find a wiring diagram for my Kenmore 90 Series washer?

Wiring diagrams are typically located inside the washer's control panel or on the back of the appliance. You can also find them online from appliance parts retailers or technical documentation providers, searching by your model number.

Kenmore 90 Series Washer Overfilling: Troubleshooting and Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance reading for the water inlet valve solenoid when it's functioning correctly?

•How do I access the diagnostic mode on my Kenmore 90 Series washer to check for error codes?

•Where can I find a wiring diagram for my Kenmore 90 Series washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: