Heating

Moin, after finally the steering no longer knärzt (geil!), I probably have a new problem with my R. This morning I wanted to turn on the heater, turn the controller completely to the right, and the thing just jumps back again (so on 3 o’clock position). “Well, that’s already 80%”, I thought and never thought about it again, but out of the ventilation came (100km long) only cold air! CTR11510 had mentioned that this probably happened more often, but I didn’t realize how to get it back. Can someone just help me? Ciao Ralle