Electrolux Washer Error Code EHC

The EHC error code on an Electrolux washer indicates a Line WD relay failure, specifically an incongruence between the line WD relay sensing circuit and the actual relay status. The WD relay (also referred to as the water drain or winding relay depending on context) is controlled and monitored by the main control board. When the board commands the relay to open or close, it simultaneously monitors feedback signals to confirm the relay has responded correctly. If the sensed state does not match the commanded state, the board registers this mismatch as an EHC fault and halts operation to prevent potential damage or unsafe conditions.

This type of relay incongruence can stem from several root causes. The relay itself may have welded contacts, meaning the contacts have fused together and the relay cannot open even when commanded to do so. Alternatively, a relay that fails to close when commanded will also trigger this mismatch. In either case, the control board detects that the physical state of the relay does not align with the expected output signal. Internal relay coil failure, carbon buildup on contacts, or mechanical relay failure can all produce this condition.

Because the sensing circuit and relay drive circuit are both routed through the main control board, a failure on the board itself can produce identical fault symptoms without the relay being defective. Damaged traces, failed driver transistors, or a faulty feedback circuit on the board can cause the sensed relay state to read incorrectly. The first diagnostic step is to inspect and test the main board, checking for visible burn marks, damaged components, or relay solder joint failures before condemning the relay itself.