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KitchenAid Dishwasher Clean Light 4 Blinks: Water Thermistor Fault

Quick Answer

KitchenAid Clean light 4 blinks is an open thermistor fault, and the key brand-specific detail is the thermistor location on KitchenAid models: it sits in the sump assembly at the bottom of the dishwasher, and on KDTM third-rack models the thermistor wiring harness is routed close to the lower spray arm motor assembly.

KitchenAid Clean light 4 blinks is an open thermistor fault, and the key brand-specific detail is the thermistor location on KitchenAid models: it sits in the sump assembly at the bottom of the dishwasher, and on KDTM third-rack models the thermistor wiring harness is routed close to the lower spray arm motor assembly. When the lower spray arm motor harness is not clipped correctly during installation or service, it can chafe against the thermistor connector and cause intermittent 4-blink faults. Check the harness routing in the sump area before replacing the thermistor. The 4-blink code on blink-only models equals the 4-3 or similar numeric code on digital display models.

KitchenaidDishwasherSeverity: mediumDifficulty: intermediate84% DIY Success
Time to Fix
25–60 min
Difficulty
intermediate
Parts Cost
$20 – $40
Tools Needed
Multimeter, Flashlight

What Does the CLEAN-4-BLINK Code Mean?

KitchenAid Clean light 4 blinks means the water temperature thermistor is open. On KDTM models, check that the lower spray arm harness is not chafing the thermistor connector before replacing parts. Replace thermistor WPW10134009 if it tests out of range.

Most Likely Causes

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

Thermistor internal failure (open circuit)40%
Thermistor wiring harness chafed or disconnected24%
Control board thermistor input circuit failure22%
Water damage to thermistor connector in sump area14%

Symptoms You May Notice

  • Clean light blinks 4 times repeatedly
  • Dishwasher may not heat water to target temperature
  • Cycle completes but 4-blink fault appears at end
  • Heated dry not performing correctly

Can you reset a Kitchenaid dishwasher to clear the CLEAN-4-BLINK code?

After replacing the thermistor or repairing the wiring, restore power and run a full wash cycle. The 4-blink clean code should not appear at cycle end if the repair was successful. Disconnect power for 60 seconds before restoring to clear any stored fault.

Tools Required for Diagnosis

MultimeterFlashlightTorx T20 screwdriver

Diagnostic Checklist

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

1

Disconnect power

Disconnect power. Remove the lower dish rack and the filter assembly. Locate the thermistor in the sump at the bottom of the dishwasher - it is typically a small cylindrical sensor with two wires, clipped into the sump housing. On KDTM models, inspect the wiring harness routing around the sump for any chafing against the lower spray arm motor assembly.

2

Disconnect the thermistor connector

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
Water Temperature ThermistorWPW10134009 · $20–$40

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $30 (Parts) vs $1000 (New Machine)

Frequently Asked Questions

What resistance should a KitchenAid dishwasher thermistor read?
A functional KitchenAid dishwasher water thermistor reads approximately 50,000 ohms (50k ohms) at room temperature (68-72F). As the water temperature increases, the resistance decreases (it is a negative temperature coefficient thermistor). A reading of OL (open loop / infinite) at room temperature confirms the thermistor has failed and needs replacement.
Can Clean light 4 blinks and 7 blinks appear at the same time on a KitchenAid?
They can appear in sequence on different cycles if both the thermistor and heating element are failing. The thermistor monitors water temperature to signal the element to heat, so a failed thermistor (4 blinks) can also prevent the element from cycling correctly, which may cause a follow-on 7-blink fault. Diagnose 4 blinks first - fix the thermistor and test before assuming the element is also failed.
Is Clean light 4 blinks the same fault on all KitchenAid dishwasher models?
Yes - 4 blinks on the Clean light consistently indicates a water temperature thermistor open circuit fault across KitchenAid dishwasher models that use the blink code system. On models with a numeric display, this same fault appears as a different numeric code but represents the same diagnosis.

Related Kitchenaid Dishwasher Error Codes

Code: HUBKitchenAid Dishwasher Error Codes: F8 E4, Clean Light Blinks, 8-4 GuideCode: CLEAN-7-BLINKKitchenAid Dishwasher Clean Light 7 Blinks: Heater FaultCode: 8-4KitchenAid Dishwasher 8-4 Error Code: Heater Fault

Same Fix Works on These Brands

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

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Models Known to Experience CLEAN-4-BLINK Errors

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

KDTM304ESS, KDTM354ESS, KDPE234GPS, KDTE234GPS, KDFE104HPS

Last verified for technical accuracy on March 14, 2026