AEG Washer Error Code E23

Error code E23 on an AEG washer indicates a fault in the measurement circuit of the drain pump triac. The triac is a semiconductor switching component on the main control board responsible for regulating power delivery to the drain pump. The control electronics continuously monitor the signal level in this measurement circuit, and E23 is triggered when that signal reads a fixed value of either 0V or 5V rather than the expected variable signal. A reading stuck at one of these two extremes indicates the circuit has lost its ability to accurately reflect the triac's operating state.

A stuck 0V reading typically suggests a short circuit or a failed triac that is no longer conducting, while a stuck 5V reading can point to an open circuit condition or a shorted gate junction within the triac. Either condition prevents the control board from verifying whether the pump is receiving power correctly, which disables normal drainage operation. Because the fault is located within the measurement and switching circuitry on the main control board itself, the diagnostic path leads directly to the electronics assembly.

The first and primary recommended diagnostic step is replacement of the main control electronics board. This is consistent with the nature of the fault: a triac failure or a failed measurement circuit trace are both integrated into the board and are generally not serviceable at the component level in the field. Inspecting the wiring harness connections to the pump and verifying there is no physical damage to the pump motor is a reasonable preliminary check before committing to board replacement, but the root cause is almost always an internal board-level failure.