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ErrBase

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.

In the field, the 8-4 code almost always comes with a dead giveaway: zero steam when you crack the door open after a cycle. Dishes are soaking wet, detergent pod's sitting at the bottom half-dissolved, nothing dried. The heater circuit's quit on you. Usually it's a cracked element from mineral buildup, honestly one of the more common calls I get on KitchenAid units. It's a pretty affordable fix compared to replacing the whole machine.

KitchenaidDishwasherSeverity: moderateDifficulty: intermediate83% DIY Success
Time to Fix
30–75 min
Difficulty
intermediate
Parts Cost
$10 – $75
Tools Needed
Phillips #2 screwdriver, Torx T20 screwdriver

What Does the 8-4 Code Mean?

OK so the 8-4 points to a heater fault, but before you even grab a multimeter, do a quick visual on the element loop inside the tub. You're looking for white crusty spots, pitting, or bubbling on the black coating. If you see that kind of physical damage there's no need to test anything, you already know what part to order. Grab some descaler while you're at it because whatever killed this element will kill the next one too.

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

  • The 8-4 code is right there on the display when the cycle finishes, sometimes it shows up mid-cycle
  • Water at the bottom of the tub is stone cold after a full wash, you can stick your hand in without flinching
  • Dishes come out completely dripping wet even after the heated dry cycle runs its full time
  • The detergent pod is laying at the bottom of the tub half-dissolved, sometimes with the clear plastic film still on it because the water never got hot enough
  • Sanitize cycle never completes or the sanitize light doesn't come on because water can't hit the required 155 degrees

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

After the repair, you'll need to clear the 8-4 from memory. Press any three buttons in a 1-2-3 sequence three times quickly, then let the dishwasher run the diagnostic cycle for about two minutes. Hit Cancel to end it. The control board re-checks the heater resistance during that diagnostic and clears the active error if everything reads normal. If the code comes right back immediately, the repair didn't take or there's a second issue to chase down.

Tools Required for Diagnosis

Phillips #2 screwdriverTorx T20 screwdriver5/16 inch nut driverDigital multimeterFlashlight or headlampNeedle-nose pliers

Diagnostic Checklist

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

ComponentComponent Under Test
Expected Range15–30 ohms
ConditionIf Open (OL) or infinite, replace component.

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 ElementWPW10518394 · $35–$75
High-Limit ThermostatWP3390291 · $10–$20

Frequently Asked Questions

Why does the KitchenAid KDTM304ESS have so many heating element failures?
These specific models are really sensitive to mineral buildup. Calcium and magnesium from hard water create a thick white crust on the element surface. That crust acts like an insulator, trapping heat inside the element until the internal wire literally melts and breaks. It's a case of a high-performance appliance meeting water quality issues. I always tell customers to use a quality rinse aid every single cycle and run a citric acid cleaner once a month. That keeps the element surface clean and extends its life considerably.
Can I use my KitchenAid dishwasher while the 8-4 code is showing?
You can, but I don't recommend it for more than a day or two. Without hot water, grease from your plates won't fully liquify and wash away. Instead it'll start coating the internal filters and drain hose, which leads to bad smells and clogs down the road. On top of that, the dishwasher will probably run for a really long time as the computer keeps trying to hit the target temperature, which puts extra wear on your circulation pump. Just get the part ordered and fix it.
What part number do I need for a KitchenAid dishwasher heating element?
For most of the KDTM and KDPE series you're looking at part number W10518394 or WPW10518394. But cross-check your model number before you order because there are a couple of variations out there. The model number sticker is on the left inner door jamb, look for it when the door's open. Genuine OEM runs about $40-60. Aftermarket parts are available around $20-30, but on a heating element that sees daily heat cycling, I'd spend the extra money on OEM. Aftermarket elements tend to fail faster in my experience, and you don't want to do this job twice.
How long does it take to replace the heating element on a KitchenAid dishwasher?
About 45 minutes if you've done it before. First timer, budget 90 minutes. You've got to pull the lower rack out, remove the spray arm, sometimes the sump cover, then get under the unit to disconnect the terminals and remove the mounting nut. I replaced three of these last Tuesday on different models and got faster each time. It's not a hard job but there are several steps in sequence. The hardest part is usually getting the old element to release if it's been in there for years with mineral scale locking it in place.
Will descaling my KitchenAid prevent the 8-4 code from coming back?
Honestly, yes, especially if you're in a hard water area. I tell every customer the same thing: run Affresh or a citric acid cleaner through a hot cycle once a month. It dissolves calcium scale before it gets thick enough to insulate the element and cause hot spots. Also use a quality rinse aid every cycle, not the cheap stuff. Good rinse aid reduces mineral deposits on the element significantly. Won't make it last forever but you'll probably get way more years out of it. Customers who do this rarely call me back for the same repair.

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: CLEAN-4-BLINKKitchenAid Dishwasher Clean Light 4 Blinks: Water Thermistor

Same Fix on Other Brands

Whirlpool dishwasher7-1:

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, KDTM604KPS, KDFM404KPS, KDPE204GPS

MS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026