850er – Heating does not go out – air conditioning unit defective?

Hej Gemeinde Since today the following problem exists: At the climate control part the heating power can no longer be regulated on the driver side. As soon as I start the ventilation, the heating tries to get me “well 28 degrees Celsius” tomorrow I wanted to read out faults, because when the engine starts the REC and the AC lights flash for about 10 seconds. I had already informed about this and have become aware of the jam air sensors. If these are defective then it can also come to the above phenomenon, or is possibly the climate control part defective? Perhaps worth mentioning. . my air conditioning is not in operation. Look forward to your feedback. Greeting Ela