Just bought an 04 Fiat Ducato Burstner T615 and having some teething problems. We are on EHU and for some reason the truma heating/water works for a while then you hear a click and the red light comes on? We had it on hot water setting only since last night and now seems to go to red light? Also the main light in the living area over the table and the awning light don’t appear to work. We were told these only work when on EHU and not 12V. Anyone any ideas? Is there a separate fuse box for ehu which won’t be on the 12V battery panel?