Electrolux Dryer Error Code E25

The E25 error code on an Electrolux dryer indicates an open circuit condition in the control thermistor, also called the Control NTC (Negative Temperature Coefficient) sensor. This thermistor is a resistance-based temperature sensor that the electronic control board monitors continuously to track temperatures within the dryer. An open circuit means the control board is receiving no signal from the thermistor, either because the sensor itself has failed internally or because the wiring connecting it to the control board has broken continuity somewhere along its path.

The control thermistor plays a critical role in regulating dryer operation. As temperature rises, the resistance of an NTC thermistor decreases in a predictable pattern. At the expected reference point, this thermistor should read approximately 50K ohms, within a 10% tolerance. When the resistance reading falls outside that range or the circuit reads as fully open, the electronic control cannot accurately track temperatures and triggers the E25 fault to prevent unsafe operation or damage to fabrics and components.

Common causes include a failed thermistor that has developed an internal break, damaged or corroded wiring harness connectors between the thermistor and the control board, or in less frequent cases, a faulty electronic control board that cannot correctly read an otherwise functional sensor. Diagnosing E25 starts with disconnecting the thermistor and measuring its resistance directly. A reading outside the 50K ohm range points to a failed sensor. A reading within spec shifts focus to wiring continuity and connector integrity before the control board itself is considered.