Viking Dishwasher Error Code F5: Water Overflow... | appliancefaults.com

Technical Background:

The F5 error code on a Viking dishwasher indicates an overflow condition. The Main Control Unit (MCU) monitors the water level using a float switch or a pressure sensor. When the water level exceeds a predetermined limit, the float switch activates or the pressure sensor sends a signal to the MCU, triggering the F5 error and shutting down the dishwasher to prevent water damage. The MCU logic dictates that when either input exceeds a threshold, it cuts power to the inlet valve and activates the drain pump.

Symptoms:

The homeowner observes standing water at the bottom of the dishwasher, the dishwasher not starting, or the dishwasher stopping mid-cycle with the F5 error code displayed. Water may be leaking from the door.

Possible Causes:

Stuck or faulty float switch.
Overfilling due to a defective water inlet valve.
Drain line blockage causing backflow.
Malfunctioning pressure sensor.
Defective control board (MCU).

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO).
2

Inspect the float switch. It is usually located at the bottom of the dishwasher. Ensure it moves freely. Use a multimeter to test for continuity when the float is raised.
3

Check the water inlet valve. Disconnect the valve and test its resistance with a multimeter. An open circuit indicates a faulty valve. Replace if needed.
4

Inspect the drain line for kinks or clogs. Disconnect the drain line from the garbage disposal or sink drain and check for obstructions.
5

Verify the pressure sensor is functioning correctly. Refer to the service manual for the correct resistance values at various water levels.
6

Inspect wiring connections to the float switch, water inlet valve, and pressure sensor for corrosion or damage. Repair or replace as necessary.
7

As a last resort, consider replacing the control board (MCU) if all other components test good.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. Verify the power is off using a non-contact voltage tester. Some components may retain a high voltage charge even after power is disconnected. Always use caution and follow proper safety procedures (LOTO - Lock Out Tag Out).

Prevention:

Regularly clean the dishwasher filter and inspect the drain line for obstructions. Avoid overloading the dishwasher with dishes that could block the spray arms and affect water distribution. Periodically run a dishwasher cleaner to prevent buildup.

Expert Tip:

After clearing the F5 error, you may need to perform a hard reset by pressing and holding the start/cancel button for 5 seconds to clear the error from the control board memory.

Frequently Asked Questions

•What is the typical resistance range for the water inlet valve solenoid?

The water inlet valve solenoid typically has a resistance between 1000 and 1500 ohms. Refer to the service manual for the exact specifications.

•Where is the float switch located in the Viking dishwasher?

The float switch is generally located at the very bottom of the dishwasher tub, often behind a protective shield or cover. It may be accessible from inside the tub or from underneath the dishwasher.

•How do I access the service mode on this Viking dishwasher?

Service mode access varies. Typically, it involves a sequence of button presses, such as pressing and holding two specific buttons simultaneously for a few seconds. Consult the specific service manual for your Viking dishwasher model.

Viking Dishwasher Error Code F5: Water Overflow Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the water inlet valve solenoid?

•Where is the float switch located in the Viking dishwasher?

•How do I access the service mode on this Viking dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: