KitchenAid Dishwasher Not Draining: Troubleshooting and... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) controls the drain pump. The MCU sends 120V AC to the drain pump motor during the drain cycle. The MCU relies on sensors to detect water levels and may stop the drain cycle if a fault is detected. Voltage paths through the MCU must be intact for proper operation. A clogged drain system or failing pump can interrupt these paths.

Symptoms:

Homeowner reports standing water in the bottom of the KitchenAid dishwasher after a wash cycle. The dishwasher does not drain, and subsequent cycles cannot be started because of the water.

Possible Causes:

Clogged drain filter
Blocked drain hose
Faulty drain pump
Defective check valve
Malfunctioning control board

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify power is off with a non-contact voltage tester.
2

Remove and clean the drain filter located inside the dishwasher tub, usually near the bottom spray arm.
3

Disconnect the drain hose from the drain port under the sink. Inspect for kinks or clogs. Clear any obstructions with pliers.
4

Access the drain pump, typically located at the base of the dishwasher. Use a 1/4-inch nut driver to remove any access panels.
5

Disconnect the wires to the drain pump and test for 120V AC when the dishwasher is in the drain cycle. If voltage is present but the pump isn't running, replace the pump.
6

Check the drain check valve (if equipped) for debris or damage. The check valve is often located near where the drain hose connects to the garbage disposal or sink drain. Replace if defective.
7

If all other components test good, the electronic control board (MCU) might be faulty. Replacement is often best left to a licensed technician technician.

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 to prevent accidental re-energizing of the circuit. High voltage is present in the dishwasher, so exercise caution.

Prevention:

Regularly clean the drain filter. Avoid putting large food particles into the dishwasher. Run the dishwasher with a dishwasher cleaner every month to prevent build-up.

Expert Tip:

Try running the dishwasher through its diagnostic cycle. To enter service mode, press the 'High Temp Scrub' 'Air Dry' 'High Temp Scrub' 'Air Dry' buttons in sequence within 6 seconds. This may trigger the drain pump to run and clear any minor obstructions. Refer to the tech sheet for your model.

Frequently Asked Questions

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

The drain pump is usually located at the bottom of the dishwasher, behind a lower access panel. You'll likely need a 1/4-inch nut driver to remove the panel. Disconnect the power before accessing.

•What voltage should I expect to see at the drain pump connector?

You should see approximately 120V AC at the drain pump connector during the drain cycle. Use a multimeter to verify.

•Where is the drain check valve located and what does it look like?

The drain check valve is usually located inline with the drain hose, either near the dishwasher or where the hose connects to the sink drain or garbage disposal. It's typically a small, rubber or plastic valve that prevents backflow. It may appear as an enlarged section in the hose.

KitchenAid Dishwasher Not Draining: Troubleshooting and Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

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

•What voltage should I expect to see at the drain pump connector?

•Where is the drain check valve located and what does it look like?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: