AEG Washer Error Code E5

The E5 error code on an AEG washer signals a fault within the heating circuit or related monitoring components. The code can be triggered by several distinct failures: a defective NTC temperature sensor producing a constant resistance value instead of varying with water temperature, a water inlet valve that fails to close and allows continuous water ingress, a failed heater element that cannot raise water temperature, a faulty fTR pressure switch, or a loose or broken connection to the heater element itself. Because multiple components share responsibility for the heating and water-level monitoring system, the E5 code requires methodical diagnosis rather than a single obvious fix.

The NTC sensor is a thermistor that changes resistance as water temperature shifts. When it becomes defective and outputs a fixed constant value, the control board cannot confirm that heating is occurring, triggering the E5 fault. Similarly, a valve that continuously lets water through disrupts the pressure and temperature balance the control board expects during a wash cycle. The heater element itself may develop an open circuit or a partial short, preventing it from generating heat altogether.

Diagnosis should begin with the NTC sensor, as it is the most accessible and frequently implicated component. From there, check the heater element for continuity and inspect all wiring connections at the heater terminal block for corrosion, looseness, or heat damage. The pressure switch should be tested for correct operation across its expected pressure range. The inlet valve requires inspection to confirm it closes fully when de-energized.