Hi again you didn't say in previous post whether it has worked in the past or not, has glow plug been changed since its not been working. If the unit has had five consecutive flame outs and/or five overheats it will be locked you will then need to clear the error code before it will run again, obviously the faults need to be rectified first. Is the electric water pump working? this runs regardless of heater and should be heard running for approx 5 mins after engine is turned off. no noise what so ever from the unit, smoke,anything.iv checked the fuses none have been pulled on this car.they had on last one (galaxy) so iv never had one..i need it on a vag com to see whats up with it...the pump must be working surely or the water wouldnt circulate around the car...