Seat Ateca Seat Heating Failure

Those symptoms do suggest a faulty heating element. Have you checked the thermal sensor? I had a similar problem with my old Volvo, but the whole seat had to come apart to get to the heating mat. Was the error code specific?

The thermal sensor was tested and is working. Are you saying some error codes point more directly to specific problems in the seat heating system?

Exactly. Some error codes can point to related parts like the sensor or wiring, instead of the heating element itself. Since you've confirmed the sensor is good, and the error code probably points to the heating mat, replacing it seems like the right move. I'd suggest taking it to a shop for the heating repair.

Repair went as expected the defective heating element was replaced. Total cost was 390€.