Electrolux Washer Error Code H3/B3

The H3/B3 error code on an Electrolux washer indicates that the incoming supply voltage is too high. The control board continuously monitors the voltage level delivered to the machine, and when that voltage exceeds the acceptable operating threshold, this fault is triggered to protect internal components from potential damage. This is a line voltage fault, meaning the issue originates upstream of the washer itself, at the electrical supply rather than within the appliance's internal wiring or components.

The primary diagnostic procedure for H3/B3 is test 18, which involves checking the incoming power supply voltage while the machine is under load. Measuring voltage only at idle can sometimes give a false reading, since certain supply problems only manifest when current draw increases. Testing under load gives a true picture of what the washer is actually receiving during operation. A standard residential supply should deliver approximately 120V (for single-phase North American circuits) or 240V depending on the market and appliance configuration, and sustained over-voltage beyond rated tolerances will trigger this code.

Common sources of elevated supply voltage include utility grid irregularities, problems at the main electrical panel, a faulty or failing voltage regulator on the supply side, or a wiring issue such as a lost neutral conductor that shifts voltage distribution across legs. Because this fault reflects an external supply condition rather than a failed washer component, resolution typically requires electrical inspection of the home's wiring, the outlet circuit, and potentially consultation with the local utility provider.