I have a 7 series F01 2017 730D the blower fan starts runs for about 10 seconds then turns off. I scanned it with my AUTEL and got the following IHKA (integrated automatic heating and A/C system 801207 Blower output stage: open circuit detected in load circuit is this a common thing, easy fix I can do myself or expensive workshop repair? my car stands for weeks at a time its not used daily as I have my work van, so the battery seems low when starting could this be part of the problem I know theses car can get gremlins because of low voltage it looks like the original battery that it was built with, is it worth changing that first? any help would be great.