Hello I have a 463336er with auxiliary heating. In the coolant circuit it has a circulating pump that often breaks down. G disease! After replacing this, I would like to know when it will start operation with continuous auxiliary heating? Also I did not find on my backup plan any fuse that I could assign to the pump? But what I found is the position heater = No. D ? Heater ? Who can help me here to find out if the new pump works? By the way, I did not find an error message on my star diagnosis (short test) regarding the pump? Gruss Michigan