Maytag Dishwasher Drain Pump Cover Rattle: Easy Fix... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) activates the drain pump by sending a 120V AC signal. The drain pump motor spins, evacuating water from the dishwasher tub through the drain hose. If the drain pump cover is loose, vibrations from the pump motor will cause the cover to rattle against the pump housing.

Symptoms:

US homeowners often report a loud rattling or buzzing noise coming from the dishwasher, especially during the drain cycle. The noise may be intermittent or constant during the drain phase. Visible inspection reveals the drain pump cover appears loose or not fully seated.

Possible Causes:

Loose drain pump cover clips
Damaged drain pump cover seal
Debris lodged between the cover and pump housing
Warped drain pump cover
Faulty drain pump impeller contacting the cover
Excessive vibration from a failing drain pump motor

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO).
2

Open the dishwasher door and remove the lower rack.
3

Locate the drain pump cover, typically at the bottom of the dishwasher tub, near the sump.
4

Using a 1/4-inch nut driver or Torx bit (size may vary), carefully remove any screws securing the drain pump cover.
5

Inspect the drain pump cover and its seal for damage or debris. Clean thoroughly.
6

Ensure the drain pump impeller spins freely. If obstructed, remove any debris.
7

Reinstall the drain pump cover, ensuring it is properly seated and securely fastened. Verify a tight seal.

Safety Warning:

Always disconnect power to the dishwasher before attempting any repairs. High voltage components are present. Lock Out/Tag Out (LOTO) procedures must be followed to prevent accidental energization during repairs.

Prevention:

Regularly clean the dishwasher filter and sump area to prevent debris buildup that can obstruct the drain pump and cause excessive vibration. Periodically inspect the drain pump cover for looseness.

Expert Tip:

Some Maytag dishwashers have a service mode. Simultaneously press and hold the 'Start' and 'High Temp' buttons for 3 seconds to enter the service diagnostic mode. Run the drain cycle test to further isolate drain pump issues.

Frequently Asked Questions

•How do I access the drain pump if it's not readily visible?

On some Maytag dishwashers, you may need to remove the inner bottom panel of the dishwasher tub to access the drain pump assembly. This usually involves removing several screws around the perimeter of the panel.

•What type of lubricant should I use on the drain pump cover seal?

A silicone-based grease is recommended for lubricating the drain pump cover seal. This will help to create a watertight seal and prevent the cover from sticking.

•How do I know if the drain pump motor is failing and causing excessive vibration?

If the drain pump motor is excessively loud, vibrates excessively even with the cover secured, or intermittently fails to drain, it may be failing and need replacement. Use a multimeter to test the motor windings for continuity; a reading of infinity (open circuit) indicates a failed motor.

Maytag Dishwasher Drain Pump Cover Rattle: Easy Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump if it's not readily visible?

•What type of lubricant should I use on the drain pump cover seal?

•How do I know if the drain pump motor is failing and causing excessive vibration?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: