Hi all, wonder if anyone can help? We’ve got a 4yr old Chausson with a diesel heater we’ve had from new, the heater has always been a bit fussy to get the right temp but using for the first time this season this week just to take the chill off in the evenings, it’s only working on close to full temp. Tried the usual start on max (or won’t fire) and then drop the temp once running for a little while but just stops and doesn’t cut in again at all until turned back to max. Anyone got an idea please as will be using it plenty soon now the evenings are getting cooler and through winter?