Admiral Dishwasher Drain Pump Humming, Not Draining:... | appliancefaults.com

Technical Background:

The dishwasher's main control unit (MCU) sends a 120V AC signal to the drain pump motor when it's time to drain the water. This voltage energizes the motor, causing the impeller to spin and pump water out through the drain hose. If the voltage is present but the pump isn't working, the problem lies within the pump itself or the drain path.

Symptoms:

The Admiral dishwasher is running through its cycle, but the drain pump is only humming and not removing water from the tub. The dishwasher might display an error code (if equipped), or it may simply leave standing water at the end of the cycle.

Possible Causes:

Drain pump impeller obstruction
Faulty drain pump motor
Clogged drain hose
Blocked air gap (if installed)
Failed drain pump relay on the control board

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify 120V AC is OFF at the dishwasher junction box.
2

Access the drain pump. This is typically located at the bottom of the dishwasher, accessible from the front after removing the lower access panel using a 1/4-inch nut driver.
3

Inspect the drain pump impeller for obstructions. Common culprits are food particles, glass shards, and small objects. Remove any debris.
4

Disconnect the drain hose from the drain pump. Check for clogs in the hose. Use a wire hanger or similar tool to clear any obstructions.
5

Use a multimeter to test the drain pump motor for continuity. A reading of OL (Open Loop) indicates a failed motor. Replace the drain pump if needed.
6

Inspect the drain pump relay on the main control board (MCU) for signs of damage (burnt components). If the relay is faulty, consider replacing the entire control board, as component-level repair is often difficult.
7

Reassemble the dishwasher and restore power at the breaker panel. Run a short test cycle to verify proper draining.

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. Working with electrical components involves the risk of electric shock. Ensure proper safety precautions are taken when dealing with 120V AC circuits.

Prevention:

Regularly clean the dishwasher filter and remove any food debris. Avoid placing large or hard objects in the dishwasher that could potentially clog the drain pump. Periodically check and clean the air gap (if installed) to prevent blockages.

Expert Tip:

Some Admiral dishwashers have a service mode. Consult the technical service manual for your specific model to access service mode and run a drain pump test. This allows you to directly activate the drain pump and check its operation.

Frequently Asked Questions

•How do I locate the dishwasher's tech sheet?

The tech sheet is usually located behind the kick panel or taped to the inside of the dishwasher's cabinet. It contains wiring diagrams, troubleshooting steps, and part lists.

•What's the typical resistance range I should expect to see when testing the drain pump motor with a multimeter?

The resistance should typically be between 20 and 120 ohms. Consult the tech sheet for the specific value for your model.

•How do I access the main control board (MCU) to inspect the drain pump relay?

The control board is usually located behind the control panel on the dishwasher door or behind the kick panel. You will need to remove screws to access the control board.

Admiral Dishwasher Drain Pump Humming, Not Draining: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I locate the dishwasher's tech sheet?

•What's the typical resistance range I should expect to see when testing the drain pump motor with a multimeter?

•How do I access the main control board (MCU) to inspect the drain pump relay?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: