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Whirlpool Dishwasher Red Light: What It Means on Each Model

Quick Answer

A red light on a Whirlpool dishwasher has different meanings depending on the model and where the light is located. Many WDT series models have a red or orange 'cycle running' LED that projects onto the floor (a feature called CycleSignal or a similar name) to indicate the dishwasher is actively running - this is normal and not an error.

A red light on a Whirlpool dishwasher has different meanings depending on the model and where the light is located. Many WDT series models have a red or orange 'cycle running' LED that projects onto the floor (a feature called CycleSignal or a similar name) to indicate the dishwasher is actively running - this is normal and not an error. A red light on the sanitize button indicates the sanitize requirement was not met. A red status light on the display alongside a fault code indicates an active error.

WhirlpoolDishwasherSeverity: low85% DIY Success
Time to Fix
2–45 min
Difficulty
beginner
Parts Cost
$35 – $65
Tools Needed
Multimeter

What Does the RED-LIGHT Code Mean?

A red light on the floor under the dishwasher (CycleSignal) is normal and means the cycle is running. A red sanitize light means the heat threshold was not reached. A red light on the display with an error code is an active fault.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

CycleSignal floor projection light (normal operation feature)40%
Sanitize threshold not reached - heating element fault24%
Door ajar indicator on some model variants22%
Active error code displayed alongside red indicator14%

Symptoms You May Notice

  • Red or orange light visible on kitchen floor in front of dishwasher
  • Red Sanitize indicator after cycle ends
  • Red indicator light on control panel with accompanying code

Can you reset a Whirlpool dishwasher to clear the RED-LIGHT code?

Hold Cancel/Drain 3 seconds to clear a sanitize indicator. For a CycleSignal floor light, no reset is needed - it turns off when the cycle ends.

Tools Required for Diagnosis

Multimeter

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Identify where the red light is located

Identify where the red light is located: (a) projected on the floor below the dishwasher, (b) on the Sanitize button or sanitize indicator, or (c) on the main display alongside a code. Each has a different meaning.

2

If the red light is the Sanitize indicator after a cycle: hold

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Heating Element AssemblyW10518394 · $35–$65

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $50 (Parts) vs $700 (New Machine)

Frequently Asked Questions

What is the red light on the floor in front of my Whirlpool dishwasher?
This is the CycleSignal light - a feature on many WDT and WDF series models that projects a small red or green dot onto the floor so you know the cycle is actively running even though the dishwasher is quiet. It turns off automatically when the cycle ends. It is not an error or warning.
My Whirlpool dishwasher sanitize light stays red after the cycle - is this a problem?
Yes, but often a minor one. The sanitize indicator stays red when the cycle did not confirm reaching 150F for the required time. Opening the door before the cycle fully completed is the most common cause. Run a new complete cycle without interruption first before diagnosing the heater.

Related Whirlpool Dishwasher Error Codes

Code: CLEAN-BLINKWhirlpool Dishwasher Clean Light Blinking: What It Means and How to Fix ItCode: SANITIZE-BLINKWhirlpool Dishwasher Sanitize Light Blinking: Causes and FixesCode: F7 E1Whirlpool Dishwasher F7 E1 Error Code: Heater Circuit Fault

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience RED-LIGHT Errors

This repair applies to most Whirlpool dishwashers with this error code. Common model numbers include:

WDT780SAEM, WDF550SAHZ, WDT730PAHZ, WDT750SAHZ, WDT970SAHZ, WDF518SAHM, WDT720PADE

Last verified for technical accuracy on March 14, 2026