F11 is usually the NTC on the heater..
What is the Enr of the appliance?
Is it not etched into the metal at the top of the doors inner panel?
Excellent.. one moment please
That version has the NTC Sensor that sits on top of the heater...
Test the heater to make sure it is ok.. if it is, just replace the NTC part number 00165281
To test the heater you need to access the heater area by removing the base panel of the appliance.. you can remove the base panel by tipping the appliance onto its back and unclipping the locking tabs..
Once removed, use the multimeter on a continuity setting to ensure that the heater has continuity.
If yes, just replace the NTC that is on top of the heater.
If no, then replace both the heater and the NTC