Whirlpool TotalCoverage Dishwasher Spray Arm Rotation... | appliancefaults.com

Technical Background:

The Whirlpool TotalCoverage dishwasher uses a diverter motor to alternate water flow between the upper and lower spray arms. The main control unit (MCU) controls the diverter motor based on the selected wash cycle. The circulation pump provides water pressure. Voltage is typically 120V AC to the diverter and circulation pumps.

Symptoms:

The homeowner notices that the dishes are not being cleaned properly, especially on the upper rack. The spray arm seems to be rotating slowly or not at all. Food particles remain on dishes after a complete wash cycle.

Possible Causes:

Clogged spray arm nozzles
Low water pressure
Faulty diverter motor
Worn diverter seal
Obstruction in the pump impeller
Defective circulation pump

Solution:

1

Turn off the dishwasher and disconnect power at the breaker panel.
2

Inspect the spray arm nozzles for clogs. Remove and clean with a small brush and running water.
3

Check the water inlet valve screen for debris. Clean if necessary.
4

Verify house water pressure is within the range of 20-120 PSI. A pressure gauge can be attached to an outside faucet.
5

Access the diverter motor (usually located at the bottom of the dishwasher). Use a multimeter to test the motor windings for continuity. If open, replace the diverter motor.
6

Inspect the diverter seal for wear or damage. Replace if necessary.
7

Check the circulation pump impeller for obstructions. Remove any debris.
8

If the above steps don't resolve the issue, test the circulation pump motor. Replacement might be necessary.

Safety Warning:

Always disconnect power at the breaker panel before working on the dishwasher. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental energization. The dishwasher contains 120V AC components.

Prevention:

Regularly clean the dishwasher filter and spray arms. Run a dishwasher cleaner with citric acid monthly to prevent mineral buildup.

Expert Tip:

Enter the dishwasher's service mode by pressing the following sequence of buttons within 7 seconds: High Temp Wash -> Heated Dry -> High Temp Wash -> Heated Dry. This will allow you to run diagnostic tests on the various components, including the diverter motor and circulation pump.

Frequently Asked Questions

•What is the correct diverter motor resistance reading?

The diverter motor resistance should typically be between 1500 and 2500 ohms. Refer to the technical service manual for exact specifications.

•How do I access the circulation pump?

The circulation pump is typically located behind the lower access panel. You'll need to remove the panel and disconnect the water lines and electrical connections to access the pump.

•What type of dishwasher cleaner is recommended for mineral buildup?

Dishwasher cleaners containing citric acid are most effective at removing mineral buildup. Follow the manufacturer's instructions for proper use. We recommend running a cleaning cycle monthly or as needed, based on water hardness.

Whirlpool TotalCoverage Dishwasher Spray Arm Rotation Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct diverter motor resistance reading?

•How do I access the circulation pump?

•What type of dishwasher cleaner is recommended for mineral buildup?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: