Whirlpool Dishwasher Not Draining: Troubleshooting Guide... | appliancefaults.com

Technical Background:

The dishwasher's MCU (Microcontroller Unit) controls the drain cycle. When the MCU signals the drain cycle, it sends a 120V AC signal to the drain pump or drain solenoid. The drain pump then activates, pumping the water out of the dishwasher. The MCU relies on sensors and timers to determine the cycle's progress. Voltage paths must be intact for the drain pump to receive power.

Symptoms:

The US homeowner reports that the Whirlpool dishwasher is not draining water. Water is standing in the bottom of the dishwasher after a long vacation. The dishwasher cycle completes, but the water remains.

Possible Causes:

Clogged drain hose
Clogged air gap
Failed drain pump
Blocked filter assembly
Defective drain solenoid
Faulty electronic control board

Solution:

1

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

Inspect the drain hose for kinks or clogs. Disconnect the hose from the garbage disposal or sink drain and check for obstructions.
3

Clean the air gap (if installed) to remove any debris.
4

Access the drain pump. Usually located at the bottom of the dishwasher. Check for debris and obstructions. Manually rotate the pump impeller to ensure it moves freely.
5

Test the drain pump with a multimeter for continuity. A typical reading would be between 5-15 ohms. If open, replace the pump.
6

Check the drain solenoid (if equipped) for proper operation. Use a multimeter to check for continuity. If there is no continuity, replace the solenoid. Also, ensure the solenoid is receiving 120V AC during the drain cycle.
7

If all other components test good, the electronic control board may be faulty and require replacement.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before beginning any repairs. Follow Lock-Out/Tag-Out (LOTO) procedures to prevent accidental re-energization. Be aware of potentially high voltages (120V AC) when testing electrical components. Wear appropriate personal protective equipment (PPE).

Prevention:

Run the dishwasher regularly, even when empty, to prevent components from drying out and sticking. Use a dishwasher cleaner monthly to remove buildup and prevent clogs. Inspect and clean the filter assembly regularly. Periodically check the drain hose for kinks or damage.

Expert Tip:

Some Whirlpool dishwashers have a diagnostic service mode. To access it, try pressing the following buttons in sequence within 7 seconds: High Temp Wash, Heated Dry, High Temp Wash, Heated Dry. This will run a diagnostic cycle, displaying error codes that can help pinpoint the problem.

Frequently Asked Questions

•How do I access the drain pump on my Whirlpool dishwasher?

The drain pump is usually located at the bottom of the dishwasher. You will typically need to remove the lower access panel or kickplate to access it. In some cases, you may need to partially disassemble the dishwasher to get to it.

•What type of drain pump should I use as a replacement?

Use the exact replacement part number recommended by Whirlpool for your specific model. Using an incorrect pump could damage the dishwasher or prevent it from draining correctly.

•How do I clear a clogged drain hose?

Disconnect the drain hose from the dishwasher and the drain connection (garbage disposal or sink drain). Use a snake or a long, flexible brush to clear any obstructions. You can also flush the hose with water to remove any remaining debris.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on my Whirlpool dishwasher?

•What type of drain pump should I use as a replacement?

•How do I clear a clogged drain hose?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: