Roper Dishwasher Loud Growling Noise During Drain:... | appliancefaults.com

Technical Background:

MCU logic and voltage paths.
The Roper dishwasher's Main Control Unit (MCU) activates the drain pump relay, sending 120V AC to the drain pump motor. This motor spins an impeller, forcing water through the drain hose. A thermistor monitors water temperature, which can affect drain time, but not directly cause the growling noise.

Symptoms:

US homeowner observations.
The dishwasher is making a loud, growling noise specifically during the drain cycle. This noise is new and wasn't present before. The dishwasher still seems to be draining water, but the noise is concerning.

Possible Causes:

Foreign object lodged in the drain pump impeller.
Worn or damaged drain pump motor bearings.
Partially clogged drain hose restricting water flow.
Defective drain pump motor.
Air lock in the drain system.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the drain pump, usually at the bottom of the dishwasher. Access it by removing the lower access panel using a 1/4-inch nut driver.
3

Inspect the drain pump for any visible obstructions like food particles, glass shards, or other debris. Remove any obstructions.
4

Disconnect the drain hose from the drain pump and check for clogs. Clear any blockages with a stiff wire or pliers.
5

If no obstructions are found, test the drain pump motor windings for continuity using a multimeter. A reading of OL (open line) indicates a faulty motor.
6

If the motor windings have continuity, reconnect power and briefly activate the drain cycle. Use caution! Check for 120V AC at the drain pump motor terminals.
7

If the drain pump is receiving power but still growls loudly, replace the drain pump assembly.

Safety Warning:

LOTO and high voltage warning.
Always disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. High voltage is present when the appliance is powered on. Exercise caution when testing electrical components.

Prevention:

Specific maintenance.
Regularly clean the dishwasher filter to prevent food particles from entering the drain pump. Avoid placing large or hard objects in the dishwasher that could potentially damage the pump. Run a dishwasher cleaner cycle monthly.

Expert Tip:

Trade secret or service mode sequence.
Many Roper dishwashers have a service mode. Check the tech sheet behind the lower access panel for the key sequence to enter service mode. Once in service mode, you can manually activate the drain pump for testing purposes. This can isolate the problem faster.

Frequently Asked Questions

•What is the resistance range I should expect when testing the drain pump motor windings?

The resistance should typically be between 15-30 ohms. A reading of 0 ohms indicates a short, and OL indicates an open circuit.

•How do I properly clear the drain hose of a clog?

Disconnect the drain hose from both the dishwasher and the drain connection under the sink. Use a stiff wire or a drain snake to carefully break up and remove any blockage. Flush the hose with water to ensure it's clear.

•What is the best way to prevent debris from entering the drain pump?

Scrape plates thoroughly before loading them into the dishwasher. Clean the dishwasher filter regularly, at least once a month. Consider using a food disposer in your sink to reduce the amount of food waste entering the drain system.

Roper Dishwasher Loud Growling Noise During Drain: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance range I should expect when testing the drain pump motor windings?

•How do I properly clear the drain hose of a clog?

•What is the best way to prevent debris from entering the drain pump?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: