AEG Washer Error Code E38

Error code E38 on an AEG washer indicates a fault in the measurement circuit associated with dry run protection sensor 2. The control board continuously monitors this circuit's output voltage to confirm the sensor is functioning within its operating range. When the board detects that the circuit is reading a fixed 0V or a fixed 5V with no variation, it interprets this as a measurement circuit failure rather than a real sensor reading. A stuck signal at either extreme suggests the circuit has lost the ability to report meaningful data.

Dry run protection is a safety function that detects whether the pump or motor is operating without water present, which can cause overheating and premature component wear. The measurement circuit for this protection typically involves a voltage divider or similar analog circuit on the main control board, along with associated wiring and sensors. If the circuit output is permanently at 0V, there may be a short to ground or a failed component pulling the line low. If it is stuck at 5V, an open circuit or a failed pull-up condition is likely.

Because the fault is isolated to the measurement circuit itself rather than a simple sensor reading, the diagnostic path points directly to the main electronics assembly. Wiring harness damage, corroded connector pins, or an internal failure on the control board can all produce this fixed-voltage condition. Since the first recommended diagnostic step is to replace the electronics, technicians should inspect connectors and wiring first before committing to a board replacement, but the board itself is the most probable root cause when wiring checks out clean.