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So I charged the system up to 1.5 bar then isolated the boiler by closing the flow and return valves and sure enough it lost about 0.5 bar overnight again. So I guess it must be a problem with the boiler. I also tried putting a small back over the discharge pipe outside and no water has...

Thanks for all the advice guys. I filled they system to 1.5 bar last night and left the boiler turned of until this morning and it has lost just over 0.5 bar overnight. I am going to try the same excercise tonight with the boiler isolated by closing the flow and return valves. Will let...

I have had our Halstead boiler relocated in the house and new radiators and pipework installed. Everyting has been ok for a few months but recently the boiler has started losing pressure at the rate of about 1bar a week. I have check all the radiator valves and the blow off valve and the...