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

Technical Background:

The Main Control Unit (MCU) controls the wash pump motor, which provides water pressure to the spray arm. The MCU receives signals from the water level sensor and timer to determine the wash cycle. Voltage from the breaker flows to the MCU which then powers components like the wash motor.

Symptoms:

The homeowner notices that dishes are not being cleaned properly, especially on the upper rack. The spray arm isn't spinning, or it's hitting the heating element and stopping.

Possible Causes:

Clogged spray arm nozzles
Low water pressure
Faulty wash pump motor
Debris in the wash pump impeller
Blocked water inlet valve
Defective spray arm assembly

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify 0V AC at the dishwasher's receptacle using a multimeter.
2

Inspect the spray arm nozzles for clogs. Use a small wire or toothpick to clear any obstructions.
3

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

Access the wash pump motor (usually located at the bottom of the dishwasher). Visually inspect the impeller for any obstructions.
5

If the impeller is clear, use a multimeter to test the wash pump motor windings for continuity. Consult the wiring diagram for correct resistance values.
6

Examine the spray arm assembly for physical damage or deformation that might cause it to bind against the heating element. Replace if damaged.
7

Reassemble the dishwasher and restore power. Run a test cycle to verify proper spray arm rotation.

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. High voltage is present when the dishwasher is powered on.

Prevention:

Regularly clean the dishwasher filter and spray arms to prevent clogs. Run a dishwasher cleaner cycle monthly to remove mineral buildup and food debris. Ensure adequate water pressure to the dishwasher.

Expert Tip:

Many Roper dishwashers have a service mode. Entering the service mode allows you to manually activate different components, like the wash pump, to aid in diagnostics. Consult the technical sheet, usually located behind the lower access panel, for the specific service mode entry sequence for your model.

Frequently Asked Questions

•What is the proper resistance reading for the wash pump motor windings?

The resistance reading varies by model. Consult the specific wiring diagram for your Roper dishwasher. Typical values are between 5 and 15 ohms.

•How do I access the wash pump motor in my Roper dishwasher?

Typically, you'll need to remove the lower access panel and the spray arm assembly. Then, disconnect the water supply and electrical connections to the pump. The pump is often secured with screws or clips.

•My water pressure is good. What else could cause low spray arm pressure?

A failing wash pump motor, even if it seems to run, can produce insufficient pressure. Also, a partially blocked circulation pump or diverter valve (if equipped) could be restricting water flow.

Roper Dishwasher Spray Arm Not Rotating or Blocked: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance reading for the wash pump motor windings?

•How do I access the wash pump motor in my Roper dishwasher?

•My water pressure is good. What else could cause low spray arm pressure?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: