X Klasse Climate Control Problem

I had a similar problem with my Mercedes, though not an X Klasse. The symptoms sound familiar. Have you checked the temperature reading from the sensor itself? Sometimes the climate regulation goes crazy if it gets a wildly inaccurate temperature reading. That was the case for me.

How did you check the temperature reading? Did you use a diagnostic tool?

Yes, I used a diagnostic tool to access the live data stream. It pinpointed the issue right away. Given the error stored in your memory and the symptoms, it's likely a faulty connection as you suspect. If you're not comfortable with diagnostics, it might be best to take it to a workshop. They can diagnose it properly and fix the connection.

Thanks for the advice. I followed your suggestion and took it to a workshop. They confirmed a defective cable/plug connection on the temperature sensor, as suspected. Repair cost 95€. It's all working now.