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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.

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. Check spray arm rotation first, then test the high-limit thermostat WD21X10476 and the NTC thermistor WD21X10376 before suspecting the control board.

GeDishwasherSeverity: highDifficulty: intermediate80% DIY Success
Time to Fix
25–75 min
Difficulty
intermediate
Parts Cost
$10 – $22
Tools Needed
Multimeter, Torx T20 screwdriver

What Does the 1H Code Mean?

1H fires when the tub temperature exceeds safe limits. A blocked spray arm causing water to pool over the tub heater is a GE-specific trigger that precedes actual thermostat failure in many cases.

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 code on display mid-cycle or at end of heated dry
  • Steam escaping from door vents excessively
  • Plastics or rubber items in tub appear warped or damaged
  • Dishwasher stops and will not restart

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

Turn the breaker off for at least 5 minutes to let the tub cool. Restore power. A tripped high-limit thermostat will show as open circuit and cannot be reset by a power cycle alone. It must be replaced if it has failed.

Tools Required for Diagnosis

MultimeterTorx T20 screwdriverNon-contact voltage tester

Diagnostic Checklist

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

1

Open the door and inspect the lower and upper spray arms

Open the door and inspect the lower and upper spray arms. Manually spin each arm. Confirm nothing in the rack is long enough to hit the spray arm during rotation.

2

Turn the breaker off

3

Disconnect the NTC thermistor (small two-wire probe near heater)

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
High-Limit ThermostatWD21X10476 · $10–$20
NTC ThermistorWD21X10376 · $12–$22

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $16 (Parts) vs $625 (New Machine)

Frequently Asked Questions

Can I reset the 1H error by just turning the breaker off?
A power reset will clear the code from the display, but if the high-limit thermostat has permanently tripped (open circuit on multimeter), the code will return at the next cycle. The thermostat must be replaced for a lasting fix.
Why would my GE dishwasher overheat?
The most overlooked cause is a blocked spray arm. If a tall item stops the arm from rotating, water pools at the tub bottom near the heating element, causing a localized hot spot. Always verify spray arm clearance before diagnosing the thermostat.

Related Ge Dishwasher Error Codes

Code: IHGE Dishwasher IH Error Code: Inlet Heater FaultCode: 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

Last verified for technical accuracy on March 14, 2026