LG Washer Error Code HE3

HE3 on an LG washer indicates a heater relay error, meaning the main control board has detected a fault in the relay that controls the heating element circuit. The error can occur due to electrical wire leakage in the heater circuit or a fault in the Main PCB itself. On USA models specifically, if the heater element has no measurable fault, the error is attributed to a relay malfunction on the PBA. The code may appear intermittently, which makes it especially important to inspect wiring and relay function carefully.

Continuing to run the washer with an active HE3 error is not recommended. The code points to a potential electrical fault, either a relay malfunction or wire leakage in the heater circuit, both of which involve the high-voltage heating system. Running the machine before the fault is diagnosed and corrected could pose an electrical safety risk or cause additional damage to the control board.

Repair costs depend on which component is at fault. If the issue is limited to a wiring connector or harness repair, costs are generally lower, typically in the range of $75 to $150 for a service call and labor. Replacing the main control board or PBA is more involved, with parts and labor often ranging from $200 to $400 or more depending on the specific model and local labor rates. Getting a diagnostic assessment before authorizing parts replacement helps avoid unnecessary expenses.

Some steps, such as checking for loose or corroded connectors at the heater and inspecting the wiring harness for visible damage, can be performed by a careful DIYer with the machine unplugged. However, testing relay function on the Main PCB and assessing wire leakage properly requires a multimeter and familiarity with appliance electrical circuits. If the diagnosis points to a faulty main board or relay, replacement of that component is best handled by someone comfortable working with appliance electronics.

A reset may temporarily clear the HE3 code if the fault was intermittent, but the code is likely to return if the underlying cause, such as wire leakage or a failing PBA relay, has not been repaired. Clearing the code without fixing the root problem is not a lasting solution. Use any temporary clearance as an opportunity to run a diagnostic cycle and monitor whether the fault returns under normal operating conditions.