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GE Dishwasher IH Error Code: Inlet Heater Fault Explained

Quick Answer

The GE dishwasher IH error indicates a fault in the inline water heater circuit. GE Profile and some Adora models use a separate in-line booster heater that heats incoming water before it enters the tub, distinct from the tub heater used during the wash cycle. IH fires when the NTC thermistor reads out of range or the heater element itself fails.

The GE dishwasher IH error indicates a fault in the inline water heater circuit. GE Profile and some Adora models use a separate in-line booster heater that heats incoming water before it enters the tub, distinct from the tub heater used during the wash cycle. IH fires when the NTC thermistor reads out of range or the heater element itself fails. Test the thermistor (8-40k ohms at room temperature) and the heater element (10-25 ohms) before replacing parts.

GeDishwasherSeverity: highDifficulty: intermediate82% DIY Success
Time to Fix
30–90 min
Difficulty
intermediate
Parts Cost
$12 – $80
Tools Needed
Multimeter, Torx T20 screwdriver

What Does the IH Code Mean?

IH points to the inlet heater circuit on GE Profile and Adora dishwashers. The in-line booster heater is separate from the tub wash heater. Either the NTC thermistor or the heater element itself is the most likely failure.

Most Likely Causes

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

NTC thermistor failed or reading out of calibrated range40%
Inline heater element burned out24%
Control board not sending voltage to heater circuit22%
Wiring harness to heater assembly damaged14%

Symptoms You May Notice

  • IH code displayed at start of or during fill phase
  • Wash cycle stops before completing
  • Dishes coming out cold even after a full cycle
  • Machine fills with water but heating phase never begins

Can you reset a Ge dishwasher to clear the IH code?

Hold Start/Reset for 3 seconds to cancel the current cycle. Turn the breaker off for 30 seconds before restoring power. The IH code will return if the heater circuit fault is not resolved.

Tools Required for Diagnosis

MultimeterTorx T20 screwdriverNon-contact voltage testerFlathead screwdriver

Diagnostic Checklist

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

1

Turn the breaker off

Turn the breaker off. Remove the lower access panel (kick plate) and locate the inline heater assembly. Disconnect the NTC thermistor connector, which is the small two-wire probe attached to the heater body.

2

Set multimeter to Ohms (20k range)

3

Disconnect the two heater element terminals

4

Inspect the wiring harness from the control board to the 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
Heater Assembly (Inline Booster)WD21X24899 · $45–$80
NTC ThermistorWD21X10376 · $12–$22

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $46 (Parts) vs $625 (New Machine)

Frequently Asked Questions

Does every GE dishwasher have an inline booster heater?
No. The in-line booster heater is found on GE Profile and some upper-tier Adora models. Standard Adora and entry-level GDT models rely solely on the tub wash heater. If your model does not have an inline heater, IH may point to the tub heater thermistor circuit instead.
Is the IH code dangerous to ignore?
IH is rated high severity because the dishwasher cannot properly sanitize dishes without a functioning heater circuit. Dishes may not be hygienically clean. The machine may also stop mid-cycle and leave standing water. Address this code promptly.
Can I replace just the thermistor or do I need the full heater assembly?
The thermistor (WD21X10376) is sold separately and is the cheaper first step. If the thermistor tests good and the element itself reads OL, then the full heater assembly (WD21X24899) is required.

Related Ge Dishwasher Error Codes

Code: 1HGE Dishwasher 1H Error Code: Temperature Too HighCode: H2OGE Dishwasher H2O Error Code: Water Not FillingCode: 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 IH Errors

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

PDT715SYNFS, GDT665SSNSS, GDT645SSNSS, CDT845SSJSS, ZDT800SNJSS

Last verified for technical accuracy on March 14, 2026