Whirlpool Dishwasher Not Draining: Red Light on Floor... | appliancefaults.com

Technical Background:

The red light on the floor is a status indicator, often used in Whirlpool dishwashers. When it flashes or remains on, it signifies an error. The MCU (Microcontroller Unit) on the control board monitors various sensors and components. When it detects a drain issue, it triggers the red light and may prevent the dishwasher from advancing to the next cycle. Voltage paths to the drain pump and the drain sensor need to be checked.

Symptoms:

The dishwasher is not draining after a wash cycle. A red light is projected onto the floor during or after the cycle. The dishwasher may also display an error code on the control panel (if equipped with a display). The user might also observe standing water at the bottom of the dishwasher tub.

Possible Causes:

Clogged drain hose
Failed drain pump
Blocked air gap
Faulty drain check valve
Problem with the control board/MCU

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Inspect the drain hose for kinks or clogs. Disconnect it from the garbage disposal or sink drain and check for obstructions. Clean or replace as needed.
3

Check the air gap (if installed) for blockages. Clear any debris.
4

Access the drain pump (usually located at the bottom of the dishwasher). Disconnect the wiring harness and use a multimeter to test the pump's continuity. A reading of around 15-25 ohms is typical. If no continuity, replace the pump.
5

Inspect the drain check valve (if present) for damage or debris. Ensure it opens and closes freely.
6

Examine the control board for any signs of burning or damage. If visible damage is present, the control board may need to be replaced.
7

Reconnect power and run a drain cycle to test.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures to prevent accidental re-energizing of the circuit. Dishwashers operate on 120V AC, which can be lethal.

Prevention:

Regularly clean the dishwasher filter and check the drain hose for any signs of buildup. Run a dishwasher cleaner cycle monthly to prevent clogs and maintain optimal performance. Avoid overloading the dishwasher, as this can contribute to food particles entering the drain system.

Expert Tip:

Many Whirlpool dishwashers have a service diagnostic mode. Press and hold the 'Start' button for 5 seconds, then press any other button. This will start a diagnostic cycle and can often reveal more specific error codes than the red light alone. Document the error codes for better diagnosis.

Frequently Asked Questions

•Where is the drain pump located in my Whirlpool dishwasher?

The drain pump is typically located at the bottom of the dishwasher, accessible from the inside after removing the lower rack and any debris shield. It's usually held in place by screws or a locking mechanism.

•What is the proper way to test the drain pump with a multimeter?

Disconnect the power to the dishwasher. Disconnect the wires leading to the drain pump. Set your multimeter to the ohms setting (resistance). Place the probes on the terminals of the drain pump. A typical reading should be between 15-25 ohms. An open circuit (no continuity) indicates a failed pump.

•How do I access the control board to inspect it for damage?

First, disconnect power to the dishwasher. The control board is usually located behind the control panel on the front of the dishwasher. You'll likely need to remove screws to access it. Once exposed, visually inspect the board for any signs of burning, discoloration, or damaged components.

Whirlpool Dishwasher Not Draining: Red Light on Floor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the drain pump located in my Whirlpool dishwasher?

•What is the proper way to test the drain pump with a multimeter?

•How do I access the control board to inspect it for damage?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: