GE Dishwasher 1H Error Code: Temperature Too High

Quick Answer

The GE dishwasher 1H error means the high-limit thermostat detected an over-temperature condition in the wash tub. On GE Adora and Profile models, blocked or jammed spray arms can cause water to pool near the heating element instead of circulating, creating a localized hot spot that trips the high-limit.

I've seen the 1H code on GE dishwashers more times than I can count, and honestly, the machine just saved itself from a bad situation. It's a thermal safety shutdown. Ignore it and you're looking at melted racks, warped plastic, or worse. Usually it's a jammed spray arm or a dead thermostat, both pretty fixable if you catch it before you keep running the machine.

GeDishwasherSeverity: highDifficulty: intermediate80% DIY Success

Time to Fix

25–75 min

Difficulty

intermediate

Parts Cost

$10 – $22

Tools Needed

Phillips #2 screwdriver, Torx T20 screwdriver

What Does the 1H Code Mean?

OK so a lot of people see 1H and think it says IH, which is a completely different problem. 1H means your tub got dangerously hot. Happens mostly at the end of the heated dry phase or during the final rinse. And here's the thing about GE dishwashers specifically: the high-limit thermostat on these is a one-time thermal fuse, not a reset switch. So if the water actually crossed the limit, you'll need a new part, not just a reboot.

Most Likely Causes

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

Spray arm blocked by tall item causing water to pool near heating element40%

High-limit thermostat failed (tripped and will not reset)24%

Control board overdriving heater relay22%

NTC thermistor sending incorrect high temperature reading to control board14%

Symptoms You May Notice

1H shows up on the display right at the tail end of a heated dry cycle and the machine just stops cold
You crack the door open and get blasted with a thick cloud of steam, way more than normal, and the inside feels like an oven
The Tupperware and plastic containers sitting in the bottom rack are warped or slightly melted on the sides facing the heating element
Dishwasher stops mid-cycle and won't respond to any button presses at all until you kill power at the breaker
You can smell hot plastic coming from the unit, kind of like when something gets too close to a burner on the stove

Can you reset a Ge dishwasher to clear the 1H code?

Flip your house breaker off and leave it for a full 10 minutes, not 30 seconds. Come back, flip it on, and run a short rinse cycle without heated dry. If the 1H comes right back, stop resetting it. The high-limit thermostat on GE dishwashers is a one-time thermal fuse. Once it blows, power cycling does absolutely nothing. You need a multimeter to confirm it's dead, then order the replacement part before running the machine again.

Tools Required for Diagnosis

Phillips #2 screwdriverTorx T20 screwdriverMultimeter with continuity modeNon-contact voltage testerFlathead screwdriver for releasing wire connectorsNeedle-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 Range10000–15000 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	OEM Number	Estimated Price
High-Limit ThermostatWD21X10476 · $10–$20	WD21X10476	$10 – $20
NTC ThermistorWD21X10376 · $12–$22	WD21X10376	$12 – $22

Frequently Asked Questions

Can I reset the 1H error by just turning the breaker off?

You can try flipping the breaker for 10 minutes, but don't hold your breath. If the 1H code was triggered by a genuine overheat, that thermal limit switch is probably blown for good. It's a safety device designed to fail permanently so your dishwasher doesn't catch fire or melt itself. If the code comes right back after a power reset, grab your multimeter and check that thermostat for continuity. It'll take you about five minutes and it'll tell you exactly whether you need a new part.

Why would my GE dishwasher overheat?

Beyond a blocked spray arm, a stuck relay on the main control board is the worst case scenario. If that relay welds shut, the heater stays on even when the cycle is completely done. Here's how you know it's the board and not a sensor: open the door and feel actual heat coming out even though the machine hasn't been running recently. That's your tell. Otherwise it's usually a spray arm that stopped spinning or an NTC thermistor that drifted out of its resistance range and is feeding the board bad temperature data.

What's the part number for the GE high-limit thermostat?

For most GE dishwashers from the last 10 to 15 years it's WD21X10476. That covers a big chunk of the GDT and GDF series. If you've got a Profile or Cafe model it might be slightly different, so pull the model number off the inside door jamb and double check before you order. The part usually runs $20 to $35. And honestly it's one of the easier fixes on these machines. Takes maybe 20 minutes once you've got the kickplate off and you're not fighting rust.

Can a stuck heater relay cause the 1H code?

Yeah, and that's the scenario you really don't want. If the relay on the main control board welds itself closed, the heater just runs continuously with no shutoff. No circulation, no temp regulation, just heat building up until the safety thermostat trips. I had one last month where the homeowner said the inside of the dishwasher felt warm even two hours after a cycle ended. That's the relay. The board on these runs $100 to $200 depending on the model. If the machine is already 12 or more years old, factor that into whether it's worth replacing.

Is the 1H code dangerous? Should I stop using the dishwasher?

Yes, stop using it until you figure out what's going on. 1H means temperatures got high enough to trip a thermal safety device. Keep running it and you're risking melted plastic components, damage to the tub liner, or with a stuck relay situation, a real fire hazard. This isn't a 'monitor it for a few more cycles' situation. Unplug it or flip the breaker and diagnose it first. Nine times out of ten it's a $20 to $30 thermostat fix, but you've got to confirm that before you run it again.

Related Ge Dishwasher Error Codes

Code: IHGE Dishwasher IH Error Code: Inlet Heater Fault Code: 888GE Dishwasher 888 Error Code: Control Board Fault

Same Fix Works on These Brands

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

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Models Known to Experience 1H Errors

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

GDT630PSMSS, GDT645SSNSS, GDT665SSNSS, GDF570SSJSS, PDT715SYNFS, GDT695SSJSS, GDF630PSMSS, CDT835SSJSS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026