Help please. We had a new glowworm condensing boiler fitted (and the rads pressure cleaned) a couple of months ago and are having problems with the pressure. It was fine at first when we were just heating hot water and one of the radiators, but since opening all the radiator valves and using the central heating we are having to top up the water every day to keep the pressure up and keep it working.
The pressure is maintained better when the heating and water are on constant, but when it is off for any length of time it won't restart and we get an error message. the pressure is very erratic as well when it is on. We have checked everywhere we can and cannot find a leak; we have put a bag on the boiler overspill pipe and it is dry; we have had no water from any other overflow pipes and our hot water tank is just two years old.
Any ideas or previous experience of this problem greatly appreciated. The plumber who fitted the boiler is scratching his head (but hasn't looked at the system yet)
The pressure is maintained better when the heating and water are on constant, but when it is off for any length of time it won't restart and we get an error message. the pressure is very erratic as well when it is on. We have checked everywhere we can and cannot find a leak; we have put a bag on the boiler overspill pipe and it is dry; we have had no water from any other overflow pipes and our hot water tank is just two years old.
Any ideas or previous experience of this problem greatly appreciated. The plumber who fitted the boiler is scratching his head (but hasn't looked at the system yet)