The 1H error on your GE Dishwasher means the control detected that the water is taking too long to heat to the correct temperature. This usually points to a water heating or water supply issue rather than a serious electrical fault, and many owners can clear it without calling a technician.

Error code 1H
Meaning Water heating time-out — the dishwasher did not reach the required water temperature within the expected time
Severity Medium — the dishwasher may still run but wash performance will suffer until fixed
Time to fix 10–30 minutes
Tools needed None (multimeter only needed for advanced checks)

What the 1H error means

GE dishwashers monitor how long it takes the water inside the tub to reach the target wash temperature. If this takes far longer than normal, the control board flags a 1H code and may pause or end the cycle early. It’s a protective measure to stop the dishwasher running an ineffective wash with cold or lukewarm water.

This code is most often linked to the incoming water supply being too cold, a faulty heating element, or a problem with the internal thermostat or temperature sensor. It’s similar in principle to heating-related fault codes seen on other GE appliances, such as the Ge Washing IE Error Code: Causes and Fixes, where the machine also monitors fill and temperature timing.

Common causes

  • Household hot water supply set too low or not reaching the dishwasher hot enough
  • Water inlet valve only partially opening, slowing the fill and heating process
  • Faulty or burnt-out heating element inside the tub
  • Failed thermostat or temperature sensor giving incorrect readings
  • Kinked or partially blocked hot water supply line
  • Control board fault misreading heating time

How to fix the 1H error

  1. Check your water heater setting: Make sure your home’s water heater is set to at least 120°F (49°C) so hot water reaching the dishwasher is warm enough.
  2. Run the hot tap first: Before starting the dishwasher, run the kitchen hot tap until the water is hot. This ensures the dishwasher fills with hot water from the start instead of cold water from the pipes.
  3. Inspect the water supply line: Check the hose feeding the dishwasher for kinks, twists, or blockages, and straighten or clear them as needed.
  4. Test the heating element: With power disconnected, use a multimeter to check the heating element for continuity. Replace it if it shows no continuity or an open circuit.
  5. Check the thermostat/sensor: If the element tests fine, the temperature sensor or thermostat may be faulty and need replacing.
  6. Reset the dishwasher: Turn off power at the breaker for one minute, then restore power and run a normal cycle to see if the code clears.

FAQ

Can I still use my dishwasher with a 1H error?
You can try, but wash results will likely be poor since dishes need hot water to clean and sanitize properly. It’s best to fix the cause before running more cycles.

Will resetting the dishwasher fix the 1H code permanently?
A reset may clear the code temporarily, but if the underlying cause — such as a weak heating element or cold water supply — isn’t fixed, the error will likely return.

Is the 1H error expensive to repair?
If it’s just a water temperature setting issue, it costs nothing to fix. A replacement heating element or thermostat is a moderate, affordable repair compared to a full control board replacement.