KitchenAid Dishwasher 8-4 Error Code: Heating Element Fault

Quick Answer

KitchenAid 8-4 is the heating element fault code on digital display models, and the most important brand-specific fact is the documented early failure pattern on KDTM304ESS and KDTM354ESS. These models experience heating element failure at 3-5 years of normal use, well short of the 12-year expected appliance lifespan. The cause is hard water mineral buildup - calcium and magnesium deposits coat the element coil and create localized hot spots that eventually burn through the element. If your KitchenAid is 3-5 years old and in a hard water area, the element has almost certainly failed if you are seeing 8-4. The diagnosis is straightforward: disconnect power, remove the lower rack, and measure element resistance at the terminals under the tub.

KitchenaidDishwasherSeverity: mediumDifficulty: intermediate83% DIY Success

Time to Fix

30–75 min

Difficulty

intermediate

Parts Cost

$10 – $75

Tools Needed

Multimeter, Torx T20 screwdriver

What Does the 8-4 Code Mean?

KitchenAid 8-4 means the heating element failed. On KDTM304ESS and KDTM354ESS this is a known early failure at 3-5 years from mineral buildup. Test element resistance (15-30 ohms = good, OL = failed). Replace with WPW10518394.

Most Likely Causes

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

Heating element burned out from hard water mineral deposits (KDTM304ESS/KDTM354ESS)40%

Heating element age-related coil failure24%

Control board heater output relay failed22%

High-limit thermostat tripped or failed open14%

Symptoms You May Notice

8-4 displayed on KitchenAid digital control panel
Water is cold after the wash cycle
Dishes do not dry after heated dry cycle
Cycle completes but 8-4 appears in the display
Sanitize function not completing properly

Can you reset a Kitchenaid dishwasher to clear the 8-4 code?

After replacing the heating element or thermostat, restore power and run a full hot wash cycle. The 8-4 code should clear once the water reaches the target temperature without fault. Disconnect power for 60 seconds before the test cycle to clear the stored fault code.

Tools Required for Diagnosis

MultimeterTorx T20 screwdriverPhillips screwdriverFlashlight

Diagnostic Checklist

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

Confirm the dishwasher is not heating

Confirm the dishwasher is not heating. Run a cycle and after 15 minutes, briefly open the door and feel the tub interior. It should be hot (not just warm) during the main wash. Cold water during the wash confirms the 8-4 fault is active and the element is not operating.

Disconnect power

If the element tests good

When replacing the element on a KDTM304ESS or KDTM354ESS:

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	OEM Number	Estimated Price
Heating ElementWPW10518394 · $35–$75	WPW10518394	$35 – $75
High-Limit ThermostatWP3390291 · $10–$20	WP3390291	$10 – $20

Verify part fitment for your Kitchenaid model

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs

Labor Approach

Our Verdict

REPAIR

Estimated Cost: $43 (Parts) vs $1000 (New Machine)

Frequently Asked Questions

Why does the KitchenAid KDTM304ESS have so many heating element failures?

The KDTM304ESS and KDTM354ESS heating element fails prematurely due to hard water mineral deposits. Calcium and magnesium in the water deposit onto the element coil over hundreds of cycles, creating insulating hot spots that cause the coil to overheat locally and burn through. The element typically fails at 3-5 years on moderately hard water. Running a monthly citric acid descaling cycle significantly extends element life.

Is 8-4 on a KitchenAid dishwasher expensive to fix?

If it is the heating element, the part costs $35-75 and takes about 45-60 minutes to replace. Total DIY cost is $35-75. If it is the high-limit thermostat (less common), the part costs $10-20 and is even easier to replace. The control board (if the relay has failed) costs $120-250 and is the expensive scenario, but it is the least common cause of 8-4.

Can I use my KitchenAid dishwasher while the 8-4 code is showing?

The dishwasher will complete cycles but without hot water the dishes will not sanitize, the heated dry function will not work, and wash performance will be reduced. Extended use with a failed element will also prevent the 8-4 fault from clearing after repair since the fault is being re-stored each cycle. Repair within a few weeks of the fault appearing.

Related Kitchenaid Dishwasher Error Codes

Code: HUBKitchenAid Dishwasher Error Codes: F8 E4, Clean Light Blinks, 8-4 Guide Code: CLEAN-7-BLINKKitchenAid Dishwasher Clean Light 7 Blinks: Heater Fault Code: CLEAN-4-BLINKKitchenAid Dishwasher Clean Light 4 Blinks: Water Thermistor

Same Fix on Other Brands

Whirlpool 7-1:

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 8-4 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