KitchenAid Dishwasher Red Light on Floor: Troubleshooting... | appliancefaults.com

Technical Background:

MCU logic and voltage paths.
The KitchenAid dishwasher's main control unit (MCU) monitors a float switch in the base of the unit. When water accumulates, the float rises, activating the switch. This signal triggers the red light indicator and may initiate the drain pump. The control board interprets the voltage signal from the float switch and activates the drain pump relay. Voltage paths run from the main power supply, through the float switch, and back to the control board input.

Symptoms:

US homeowner observations.
A red light is projected onto the floor during or after a wash cycle. The dishwasher may or may not complete the cycle. There may or may not be standing water visible inside the dishwasher tub.

Possible Causes:

Leak detected in the dishwasher base
Faulty float switch
Malfunctioning drain pump
Control board error related to leak detection
Damaged or loose water inlet valve
Clogged drain hose or air gap

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO).
2

Remove the lower access panel and check for standing water in the base.
3

Inspect the float switch for free movement. If stuck, clean or replace it.
4

Examine the drain pump for clogs or debris. Test pump windings for continuity.
5

Check the water inlet valve for leaks or damage. Measure resistance across the valve coil.
6

Inspect the drain hose and air gap for obstructions. Flush with hot water.
7

If no leaks are found, suspect a control board issue. Replace the control board.

Safety Warning:

LOTO and high voltage warning.
Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out / Tag Out (LOTO) procedures must be followed to prevent accidental energization. Some components may retain a high voltage charge even after power is disconnected. Use caution when working around electrical components.

Prevention:

Specific maintenance.
Regularly clean the dishwasher filter to prevent clogs. Inspect the spray arms for blockages. Run a dishwasher cleaner cycle monthly to remove buildup and prevent leaks. Check hoses and connections annually for signs of wear or damage.

Expert Tip:

Trade secret or service mode sequence.
To access the service mode on some KitchenAid models, press the following sequence within 6 seconds: High Temp Scrub - Heated Dry - High Temp Scrub - Heated Dry. This allows you to view error codes and run diagnostic tests.

Follow-up Questions: 3 relevant technical questions a user might ask next.

Frequently Asked Questions

•How do I test the float switch with a multimeter?

Disconnect power. Remove the float switch. Set your multimeter to the continuity setting. With the float down, the switch should read open (no continuity). When you manually raise the float, the switch should read closed (continuity).

•What is the correct resistance reading for the water inlet valve solenoid?

The typical resistance range for a KitchenAid water inlet valve solenoid is between 500 and 1500 ohms. Consult the service manual for your specific model for the precise value.

•Where is the drain pump located on my KDTM dishwasher?

The drain pump is typically located at the bottom of the dishwasher, either inside the sump area or directly accessible from the lower front access panel. You might need to remove the sump assembly to access it completely.

KitchenAid Dishwasher Red Light on Floor: Troubleshooting Guide (KDTM & KDTE)

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the float switch with a multimeter?

•What is the correct resistance reading for the water inlet valve solenoid?

•Where is the drain pump located on my KDTM dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: