AEG Washer Error Code E78

The E78 code means the NTC temperature sensor is not in its correct installation position. The NTC monitors water temperature, and if it is displaced or improperly seated, the control board detects that its readings are unreliable and halts operation. This is a positional fault, not necessarily a sign that the sensor itself has failed.

It is not advisable to continue running the washer with an active E78 fault. The NTC sensor is responsible for accurate temperature monitoring, and operating without a correctly positioned sensor means water temperature is not being properly regulated. This could lead to overheating or inadequate wash performance. Address the issue before running further cycles.

If the fix only requires repositioning the sensor, costs may be limited to a service call fee, typically in the range of $75 to $150 depending on your location. If the retaining clip or bracket is broken and needs replacement, parts are generally inexpensive, but total repair costs including labor can range from $100 to $250. If a full NTC sensor replacement is needed, costs fall in a similar range depending on parts pricing and technician rates.

Start by unplugging the washer and locating the NTC thermistor inside the machine. Check that it is fully seated in its mounting bracket or clip and is making firm contact with the component it monitors. If it has shifted, reposition it and ensure any retaining clip is securely engaged. If the mounting hardware is broken, that component will need to be replaced before the fault will clear.

A basic reset may temporarily clear the code, but E78 will return if the underlying positioning issue has not been corrected. The control board will detect the misaligned sensor again as soon as a new cycle begins and the temperature monitoring system is active. The physical installation of the NTC must be corrected for the fault to stay resolved.