The 3H error on your GE Dishwasher means the control board has detected that water inside the tub is not heating up as expected during the wash cycle. Checking the heating element, thermistor, and water supply usually resolves it.

Error code 3H
Meaning Water heating fault — the dishwasher failed to reach or maintain the required water temperature within the expected time
Severity Medium — the dishwasher may still run but wash and dry performance will suffer
Time to fix 15–45 minutes
Tools needed Multimeter, screwdriver, towel

What the 3H error means

GE dishwashers use a heating element and a thermistor (temperature sensor) to monitor and control water temperature during the wash cycle. The 3H code appears when the control board expects the water to reach a set temperature within a certain time window but doesn’t get the signal confirming this has happened.

This can be caused by an actual heating failure, a faulty sensor giving incorrect readings, or a wiring problem preventing communication between the heater and the control board. In some cases it’s a simple issue like unusually cold incoming water taking longer than normal.

Common causes

  • Faulty or burnt-out heating element that no longer warms the water
  • Failed or drifting thermistor sending inaccurate temperature readings to the control board
  • Loose, corroded, or damaged wiring between the heater and control board
  • Incoming water supply that is too cold, causing the cycle to run longer than the timeout allows
  • A faulty main control board that misreads sensor signals
  • Sediment or mineral buildup on the heating element reducing efficiency

How to fix the 3H error

  1. Power cycle the dishwasher. Turn off power at the breaker for 5 minutes, then restart. This clears temporary control board glitches that may cause a false 3H reading.
  2. Check your hot water supply. Run the kitchen hot tap until it’s hot before starting the dishwasher, so it doesn’t have to work from a cold start.
  3. Inspect the heating element. Open the door and look for visible damage, corrosion, or breaks in the metal element at the bottom of the tub.
  4. Test the heating element with a multimeter. Disconnect power, access the element’s wiring, and check for continuity. Replace it if there’s no continuity or resistance is far outside the normal range.
  5. Check the thermistor. Locate the sensor near the heating element or tub wall and test its resistance against the manufacturer’s spec at room temperature.
  6. Inspect wiring connections. Look for loose, corroded, or burnt connectors on the heater and thermistor circuits, and reseat or replace as needed.

FAQ

Can I still run a cycle with the 3H error showing?
You can try, but dishes may not be cleaned or dried properly since the water isn’t heating correctly. It’s best to fix the issue before running further loads.

Is the 3H error something I can fix myself?
Basic checks like verifying hot water supply and power cycling are safe for most homeowners. Testing or replacing the heating element or thermistor requires comfort with a multimeter and basic appliance repair.

How much does it cost to fix a 3H error?
If it’s just a wiring issue, it may cost nothing beyond your time. A replacement heating element or thermistor typically runs $30–$100 for parts, plus labor if you hire a technician.