Viking Dishwasher Error Code F22: Filter Blocked -... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) monitors the water flow using a flow sensor. When the MCU detects insufficient water flow, it triggers the F22 error code. The flow sensor sends a signal back to the MCU, usually a voltage reading between 0-5V DC, proportional to the amount of water flowing. If the signal is out of range or missing, the F22 error is triggered. The MCU controls the circulation pump and drain pump via relays, and it also monitors their current draw.

Symptoms:

The homeowner observes the Viking dishwasher displaying error code F22. The dishwasher may stop mid-cycle, not clean dishes effectively, or make unusual noises. Water may remain in the bottom of the dishwasher after the cycle completes.

Possible Causes:

Blocked filter causing low water flow.
Faulty flow sensor.
Defective circulation pump.
Clogged drain pump.
Wiring harness issue to the flow sensor or pump.
Main Control Unit (MCU) failure.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Inspect and clean the dishwasher filter assembly. Remove any debris.
3

Check the drain pump for obstructions. Clear any visible blockages.
4

Using a multimeter, verify the flow sensor's continuity. Consult the service manual for expected resistance values. It's usually around 2-3k Ohms.
5

Check the circulation pump impeller for damage or blockage. Ensure it spins freely.
6

Check the wiring harness connections to the flow sensor and circulation pump, look for loose connections or damaged wires.
7

If all components check out, consider replacing the main control unit (MCU). This is a last resort.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components may retain a high voltage charge even after the dishwasher is disconnected. Exercise caution when working near electrical components.

Prevention:

Regularly clean the dishwasher filter (at least once a month). Avoid placing large food particles into the dishwasher. Periodically run a dishwasher cleaning cycle with a dishwasher cleaner. Check the spray arms for clogs and clean them as needed.

Expert Tip:

Viking dishwashers often have a service mode. Consult the service manual for your specific model to access diagnostic tests and error history. This can provide valuable insights into the root cause of the problem. For some models, pressing and holding the 'Start/Reset' and 'Heated Dry' buttons simultaneously for 5 seconds may initiate the diagnostic mode.

Frequently Asked Questions

•Where is the flow sensor located in the Viking dishwasher?

The flow sensor is typically located near the circulation pump or the water inlet valve. Refer to the specific model's parts diagram for exact location.

•What is the typical resistance range for a working flow sensor?

The typical resistance range for a working flow sensor is between 2k and 3k Ohms. However, always consult the service manual for the specific model for accurate readings.

•How do I access the Viking dishwasher service mode to view error history?

Accessing the service mode varies by model. A common method involves pressing a combination of buttons simultaneously, such as 'Start/Reset' and 'Heated Dry' for 5 seconds. Consult the service manual for your specific model for the correct procedure.

Viking Dishwasher Error Code F22: Filter Blocked - Symptoms and Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the flow sensor located in the Viking dishwasher?

•What is the typical resistance range for a working flow sensor?

•How do I access the Viking dishwasher service mode to view error history?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: