Whirlpool Dishwasher Sump Filter Clogged with Grease:... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) sends a 120V AC signal to the drain pump motor via a relay. A clogged sump filter restricts water flow, causing the drain pump to work harder. If the pump runs for an extended duration without proper water flow, the MCU may log an error code (if the model has error code display) or eventually damage the pump due to overheating.

Symptoms:

The homeowner observes that the dishwasher is not draining properly after a wash cycle. There may be standing water at the bottom of the dishwasher tub. The dishes may not be cleaned effectively, and there might be a lingering odor. The dishwasher may be making unusual noises during the drain cycle.

Possible Causes:

Excessive grease buildup from food scraps.
Lack of regular dishwasher cleaning.
Hard water deposits accumulating in the filter.
Undissolved detergent residue causing blockage.
Small food particles bypassing the pre-filter screen.

Solution:

1

Disconnect power: Turn off the breaker to the dishwasher circuit. Confirm power is off using a non-contact voltage tester at the dishwasher junction box.
2

Access the sump: Open the dishwasher door and remove the lower rack.
3

Remove the filter assembly: Twist and remove the sump filter assembly from the dishwasher. You may need to use a pair of pliers if it's stuck but be careful not to break anything.
4

Disassemble the filter: Separate the various filter components of the assembly.
5

Clean the filter parts: Rinse all filter parts under hot, running water, using a brush to scrub away grease and food particles. A degreasing dish soap can be used for stubborn grease. For hard water deposits, soak parts in a vinegar solution (50/50 vinegar and water) for 30 minutes.
6

Reassemble the filter: Reassemble all filter components of the sump filter assembly in the correct order.
7

Reinstall the filter assembly: Reinstall the sump filter assembly back into the dishwasher sump, twisting to lock it in place. Ensure it is properly seated and locked.
8

Replace the rack and restore power: Reinstall the lower rack, and turn the breaker back on.

Safety Warning:

Lock Out/Tag Out (LOTO) the breaker before servicing the dishwasher. Ensure the power is disconnected before working on any electrical components. Dishwashers use 120V AC, which can cause electrocution. Use caution when handling electrical connections.

Prevention:

Scrape food scraps from dishes before loading them into the dishwasher. Run a dishwasher cleaning cycle monthly using a dishwasher cleaner or vinegar. Consider using a dishwasher salt additive if you have hard water. Check and clean the sump filter every 3 months.

Expert Tip:

Whirlpool dishwashers have a diagnostic mode. To enter it, typically you press the following button sequence within 7 seconds: High Temp Wash - Heated Dry - High Temp Wash - Heated Dry. The lights will illuminate indicating diagnostic mode. Run the diagnostic cycle to clear any error codes and ensure proper operation after cleaning the filter.

Frequently Asked Questions

•How often should I clean my dishwasher filter?

Ideally, you should clean your dishwasher filter every 3 months. However, if you notice a decrease in cleaning performance or frequent clogs, you may need to clean it more often.

•What if cleaning the filter doesn't solve the draining problem?

If cleaning the filter doesn't resolve the issue, the drain pump itself might be faulty or there could be a blockage in the drain hose. Check the drain hose for kinks or obstructions, and consider testing the drain pump with a multimeter for continuity (after disconnecting power).

•What type of brush should I use to clean the filter?

A soft-bristled brush, such as an old toothbrush or a dedicated nylon cleaning brush, is ideal for cleaning the filter. Avoid using abrasive scrub pads or steel wool, as they can damage the filter material.

Whirlpool Dishwasher Sump Filter Clogged with Grease: Cleaning Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How often should I clean my dishwasher filter?

•What if cleaning the filter doesn't solve the draining problem?

•What type of brush should I use to clean the filter?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: