Didn't read the whole thread.
If your A2 has the error code
EDIT: You would need to create an account.
If your A2 has the error code
01411 - Temperature Sensor (G18)
then the temperature sensor in the Webasto Thermotop C is defective. According to Webasto the solution is to buy a complete new unit... for hundreds for euros. But the sensor cost pennies and a replacement can be soldered in by a novice. I found this wonderful guide in german: https://a2-freun.de/forum/forums/topic/31687-a2-14-tdi-zuheizer-temperaturfühler-g18-defekt-rep-anleitung/EDIT: You would need to create an account.
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