Whirlpool TotalCoverage Dishwasher Spray Arm Not Moving:... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) sends a 120V AC signal to the spray arm motor. The motor then rotates the spray arm to distribute water throughout the dishwasher. The diverter valve, if equipped, directs water to different spray arms at specific times. If the motor fails, or the water pressure is insufficient, the spray arm will not rotate properly.

Symptoms:

The homeowner reports that the Whirlpool TotalCoverage dishwasher spray arm is not rotating during the wash cycle, although water is being sprayed from the nozzles.

Possible Causes:

Obstructed spray arm nozzles or bearings
Low water pressure entering the dishwasher
Faulty spray arm motor
Defective diverter valve (if applicable)
Damaged or worn spray arm assembly

Solution:

1

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

Remove the spray arm and inspect for any obstructions in the nozzles or bearings. Clean thoroughly.
3

Verify water pressure to the dishwasher is at least 20 PSI. Check the water inlet valve screen for debris.
4

Access the spray arm motor (usually at the back of the dishwasher). Use a multimeter to test the motor windings for continuity. A lack of continuity indicates a faulty motor.
5

If the dishwasher has a diverter valve, inspect it for proper operation. Test the diverter valve motor with a multimeter.
6

If the motor is receiving 120V AC but the spray arm still doesn't move, replace the motor.
7

Reassemble the dishwasher and test its operation.

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 to prevent accidental electrocution. The unit operates on 120V AC – potentially lethal voltages are present.

Prevention:

Regularly clean the spray arm nozzles and check the water inlet valve screen for debris. Periodically run a dishwasher cleaner to prevent buildup.

Expert Tip:

Enter the dishwasher service mode by pressing the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 3 seconds. This allows for diagnostic testing of individual components including the spray arm motor. Service mode diagnostics might display error codes related to the spray arm motor circuit.

Frequently Asked Questions

•How do I access the spray arm motor?

The spray arm motor is typically located at the rear of the dishwasher, accessible from the bottom after removing the lower access panel and sometimes the kick plate. Some models might require removing the dishwasher from under the countertop.

•What readings should I expect on the multimeter when testing the spray arm motor?

When testing the motor windings for continuity, you should expect a resistance reading, typically between 20-120 ohms. An open circuit (no reading) indicates a faulty motor. Also, verify that you are getting 120V AC to the motor during operation using your multimeter.

•What if my dishwasher doesn't have a diverter valve?

If your model doesn't have a diverter valve, focus on the spray arm motor itself, water pressure, and obstructions in the spray arm and nozzles. Insufficient water pressure might be the only reason preventing correct operation.

Whirlpool TotalCoverage Dishwasher Spray Arm Not Moving: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the spray arm motor?

•What readings should I expect on the multimeter when testing the spray arm motor?

•What if my dishwasher doesn't have a diverter valve?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: