faulty Sime boiler?

The best thing to do is check for leaks around the house.

daz
June 2009

water from the flue is due to an incorrectly sealed fue
pressure loss from the boiler should be visible internally in the boiler if no sign inside the casing / also check the safety valve discharge when the boiler is being used for hot water , does the pressure rise ? if no then you have a system leak some where in the house / flat

keith
May 2009