Viking Dishwasher Error Code F8: Diverter Valve... | appliancefaults.com

Technical Background:

The F8 error code indicates a problem with the diverter valve circuit. The MCU controls the diverter valve, which directs water to the upper or lower spray arms. The MCU monitors the diverter valve's position via feedback voltage. If the MCU does not receive the correct feedback, it triggers the F8 error.

Symptoms:

The dishwasher displays an F8 error code and may not be cleaning effectively. You might hear unusual noises during the wash cycle, or the dishwasher may stop mid-cycle.

Possible Causes:

Faulty diverter valve
Wiring harness issue to diverter valve
Clogged or restricted diverter valve
Main Control Unit (MCU) failure
Sticking diverter valve motor

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Access the diverter valve, typically located beneath the lower spray arm assembly. You may need a 1/4-inch nut driver to remove access panels.
3

Visually inspect the wiring harness connected to the diverter valve for any signs of damage or corrosion.
4

Using a multimeter, check for 120V AC to the diverter valve during the portion of the cycle when it should be active.
5

Disconnect the diverter valve and test its resistance with a multimeter. Refer to the service manual for the correct resistance range.
6

If the valve is faulty, replace it with a new Viking diverter valve.
7

Reassemble the dishwasher and restore power at the breaker panel. Run a test cycle to verify the repair.

Safety Warning:

Disconnect power to the dishwasher before performing any repairs. High voltage is present when the dishwasher is powered on. Use proper lockout/tagout (LOTO) procedures.

Prevention:

Periodically run a dishwasher cleaner to prevent buildup that could restrict the diverter valve. Avoid overloading the dishwasher, which can lead to food particles clogging the system.

Expert Tip:

After replacing the diverter valve, run the dishwasher's diagnostic cycle to ensure proper operation. To initiate the diagnostic cycle, press and hold the 'Start/Reset' and 'Heated Dry' buttons simultaneously for 5 seconds. The control panel should illuminate with various codes, indicating the diagnostic process.

Frequently Asked Questions

•What is the correct resistance range for the diverter valve?

The correct resistance range for the diverter valve is typically specified in the Viking service manual for your specific model. It usually falls between 500 and 1500 ohms. Consult the service manual for precise values.

•How do I access the Main Control Unit (MCU)?

The MCU is usually located behind the control panel at the top of the dishwasher door. Disconnect power before attempting to access it. You'll typically need to remove screws securing the inner door panel to access the MCU.

•Can a faulty circulation pump cause an F8 error?

While the F8 error directly relates to the diverter valve, a faulty circulation pump can indirectly affect it. Insufficient water pressure from the circulation pump can prevent the diverter valve from operating correctly, potentially triggering the F8 error. Check the pump's operation if the diverter valve tests good.

Viking Dishwasher Error Code F8: Diverter Valve Troubleshooting & Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the diverter valve?

•How do I access the Main Control Unit (MCU)?

•Can a faulty circulation pump cause an F8 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: