Viking Dishwasher Spray Arms Not Spinning: Troubleshootin... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) controls the circulation pump and diverter valve (if equipped) to ensure water is sprayed through the spray arms. The MCU monitors voltage levels from the water level sensor and pressure sensor to regulate water flow. Voltage paths for the pump and diverter valve can be checked using a multimeter.

Symptoms:

The homeowner reports that the spray arms inside their Viking dishwasher are not spinning or rotating during the wash cycle, resulting in dishes not getting properly cleaned.

Possible Causes:

Clogged spray arm nozzles
Low water pressure
Faulty circulation pump
Blocked filter or drain pump
Defective spray arm motor (if applicable)
Malfunctioning diverter valve (if applicable)

Solution:

1

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

Inspect and clean the spray arms: Remove the spray arms and clear any debris from the nozzles with a small wire or toothpick.
3

Check water pressure: Ensure the water supply valve is fully open and that water pressure to the dishwasher is adequate (20-120 PSI).
4

Examine the filter and drain pump: Remove and clean the filter located at the bottom of the dishwasher tub. Check the drain pump for obstructions.
5

Test the circulation pump: Using a multimeter, check the circulation pump motor windings for continuity. A reading of infinite resistance indicates a failed motor. Replace if necessary.
6

Verify the diverter valve (if equipped): Some Viking models have a diverter valve that switches water flow between the upper and lower spray arms. Check for proper operation and replace if faulty.
7

Restore power and run a test cycle: Observe the spray arms for proper rotation. If the issue persists, further diagnosis is required.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. Electrical shock hazard. Ensure the dishwasher is properly grounded. High voltage components are present. Use LOTO procedures.

Prevention:

Regularly clean the dishwasher filter (at least once a month) and run a dishwasher cleaner cycle with vinegar or a commercial dishwasher cleaner every few months to prevent buildup and clogs.

Expert Tip:

Some Viking dishwashers have a service mode that allows you to manually activate the circulation pump and diverter valve for testing. Consult the technical service manual for your specific model to access the service mode sequence. Often involves pressing a specific combination of buttons.

Frequently Asked Questions

•How do I access the dishwasher's service mode?

The service mode varies by Viking model. Consult your dishwasher's technical service manual, or search online for the specific key sequence for your model. It usually involves pressing a combination of buttons within a short timeframe.

•What voltage should I expect to see at the circulation pump?

You should expect to see 120V AC at the circulation pump when the dishwasher is in the wash cycle and the pump is energized. Use a multimeter to measure the voltage at the pump terminals.

•Where is the diverter valve located and how do I test it?

The diverter valve is typically located near the circulation pump. To test it, disconnect power and use a multimeter to check the coil resistance. Then, apply 120V AC to the valve and ensure it switches positions. If it doesn't switch or the resistance is out of spec, replace it.

Viking Dishwasher Spray Arms Not Spinning: Troubleshooting & Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the dishwasher's service mode?

•What voltage should I expect to see at the circulation pump?

•Where is the diverter valve located and how do I test it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: