Amana Dishwasher Spray Arm Not Rotating or Blocked: How... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) controls the water inlet valve and the circulation pump motor. When the wash cycle starts, the MCU energizes the water inlet valve, allowing water to fill the tub. Once the water level is correct, the MCU powers the circulation pump motor, which forces water through the spray arms. If the spray arms are blocked or the pump is failing, dishes won't get properly cleaned. Voltage to the circulation pump is typically 120V AC.

Symptoms:

The homeowner reports that dishes are not getting clean, especially those on the upper rack. They also observed that the spray arm isn't spinning as it should and may be getting stuck against the heating element.

Possible Causes:

Clogged spray arm nozzles
Low water pressure
Faulty circulation pump motor
Debris blocking the spray arm or pump inlet
Heater element obstructing spray arm rotation
Defective water inlet valve

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Inspect spray arm nozzles for clogs. Remove the spray arm and clean each nozzle with a small wire or toothpick.
3

Check the water inlet valve for proper operation. Use a multimeter to test the valve's solenoid for continuity. Replace if open.
4

Examine the circulation pump. Check for debris obstructing the impeller. If the impeller spins freely by hand but not during operation, the motor may be failing.
5

Verify water pressure to the dishwasher using a water pressure gauge connected to the supply line. Should be between 20-120 PSI.
6

Inspect the heater element for physical damage or warping that could obstruct the spray arm. Replace if necessary.
7

Reassemble the dishwasher and test its operation through a full wash cycle.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures to ensure the circuit remains de-energized. Dishwashers operate on 120V AC, which can cause electrocution.

Prevention:

Regularly clean the dishwasher filter to prevent debris from entering the circulation pump. Periodically inspect and clean the spray arm nozzles. Use a dishwasher cleaner monthly to prevent mineral buildup.

Expert Tip:

To access the diagnostic mode on many Amana dishwashers, press and hold the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 3 seconds. This may display error codes related to the circulation pump or water inlet valve.

Frequently Asked Questions

•How do I remove the spray arm?

Most Amana dishwashers have spray arms that either twist and lock or are held in place with a retaining clip. Inspect the base of the spray arm for a release mechanism.

•How do I check the water inlet valve with a multimeter?

Disconnect the wires from the water inlet valve. Set your multimeter to the ohms setting (resistance). Place the probes on the terminals of the valve's solenoid. A reading of infinity (OL) indicates an open circuit, and the valve needs to be replaced. A typical reading is between 500-1500 ohms.

•How do I access the circulation pump?

You typically need to remove the lower spray arm, the filter assembly, and any additional components covering the pump housing. This may involve removing the dishwasher from under the counter for better access. Disconnect power and water supply before starting.

Amana Dishwasher Spray Arm Not Rotating or Blocked: How to Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I remove the spray arm?

•How do I check the water inlet valve with a multimeter?

•How do I access the circulation pump?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: