LG Dishwasher Error Code HE

The HE code on an LG dishwasher stands for heater error. It means the dishwasher has detected that the water is either not heating up as expected during a wash cycle or has exceeded the maximum safe temperature of 194°F. The fault can originate from wiring problems, a faulty thermistor, a failed heating element, high inlet water temperature, or a defective relay or control board.

You should not continue running the dishwasher while the HE error is active. If the code is triggered by an overheating condition, continued operation could cause damage to the tub, internal components, or wiring. If it is caused by a heating failure, the dishwasher will not sanitize dishes properly. It is best to resolve the fault before resuming normal use.

A reset may temporarily clear the HE error code, but if the underlying fault is still present, the code will return once the dishwasher attempts to heat the water again. To truly resolve the issue, the faulty component, whether it is a wiring connection, thermistor, heating element, or control board relay, needs to be identified and repaired or replaced. A reset is a useful first step to rule out a temporary glitch but is not a permanent fix.

Some causes of the HE error are DIY-friendly. Start by checking the wiring connections to the heater and thermistor and reseating any loose connectors. You should also verify that your home's hot water supply is not delivering water at an unusually high temperature. If the wiring looks fine, testing the thermistor and heating element with a multimeter is within reach for someone comfortable with basic appliance diagnostics. Control board or relay issues are more complex and may warrant a professional technician.

Repair costs vary depending on the root cause. A thermistor replacement is typically one of the less expensive fixes, with parts generally ranging from $15 to $50. A heating element replacement usually falls in the $20 to $80 range for parts. Control board replacement is the most costly option, with parts often ranging from $100 to $250 or more, plus labor if you hire a technician.