Quick summary
If HE (heater error) or tE (temperature sensor) appears, LG's guidance is to request service. You can confirm the program and restart once, but real diagnosis requires measurement.
Heating dissolves grease and helps drying. The dishwasher relies on a heater and temperature sensor; when it detects a fault it shows a code and stops heating.
Unplug the appliance, close the water tap if there's a leak, and never open covers that need tools or expose wiring or circuits.
Possible causes
Heater failure
Water temperature doesn't rise (HE).
Thermistor failure
Incorrect reading (tE).
Scale build-up
Reduces heating efficiency.
Eco program
Some programs use lower temperatures and longer times.
Safe checks you can do
- Check the selected program—eco modes run cooler.
- Unplug for a minute and restart once.
- Note the code shown to speed up diagnosis.
When to stop checking immediately
- Don't remove panels to reach the heater.
- If HE or tE returns.
Related components
- Heating element
- Control board
- Wash & drain pumps
When do you need a technician?
The technician measures the heater, thermistor, wiring and board output, and checks water circulation since weak circulation can affect heating.
Related error codes
FAQ
What does HE mean on an LG dishwasher?
Heater error—water isn't heating properly. LG recommends requesting service.
Why are dishes still wet?
Possibly no rinse aid, a quick program or weak heating.
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