LG Dishwasher HE — Heater error
LG Dishwasher · Error code HE
What HE Means
The control was unable to raise the water to the expected temperature in the allotted time, or it detected overheating above approximately 149°F. The heater circuit is disabled to prevent damage.
Symptoms
- HE shown late in the cycle
- Dishes not drying / poor wash results
- Long cycle times
- Plastic items not fully heated
Common Causes
Internal break in the sheath heater at the sump — no current draw.
Temperature sensor reads out of range; HE and tE can be related.
Heater relay on the main PCB welded closed or open.
One-shot thermal fuse on the heater opened from a prior dry-fire.
Discolored / melted ring terminal at the heater pin under the unit.
How to Fix It
- Power off at the breaker 2 minutes; restart and run a Heavy cycle to confirm HE returns.
- Tip the unit back and inspect the two heater terminals for discoloration; reseat or replace terminals.
- Disconnect heater wires and measure resistance — open circuit means replace the heater.
- Measure thermistor resistance cold (typically ~50–60 kΩ at room temp; check service manual).
- Inspect any inline thermal fuse and replace if open.
- If heater, thermistor, and fuse all test good, replace the main PCB.
- After repair, run a long hot cycle and confirm the tub gets warm to the touch.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More LG Dishwasher Codes
Verified against manufacturer documentation: lg.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.