I'm really disappointed in VW jumping to the conclusion that the heat exchanger is immediately the problem (the dearest item)when the errors clearly show that the flap position sensor is stuck/grounded as mentioned in my previous post. The small plastic actuator is really not fit for purpose and VW don't even list it as a spare part, you need to by the whole motor unit with the actuator on it. I had to buy a replacement piece on the internet and plug it in to the motor.
This is basically a mechanical piece failing and then producing an electrical fault when the potentiometer in the motor revolves too far.
Cannot understand why they won't just take a torch and look up under the foot well with the small panel removed and visually check the flap linkage! They should know where it is.
Might be worth another chat and ask to speak to a technician? Failing that another dealer if they don't seem to be playing ball, they're not exactly going out of their way to help you much.
