Re: Boiler Pressure Loss?
its your expansion vessel, either needs pumping up or it needs replacing. when you repressurise the system in the morning the system is cold. turn the heating on and the water heats up expands and discharges out the prd.when it gets below 3 bar pressure it stops discharging and carries on running because the hot water is expanded. when the heating goes off the hot water cools(contracts) and looks like you have lost pressure, sometimes it loses enough pressure to stop the boiler firing up on its next set time. if you watch the pressure guage when you fill up you will see it pressurises quickly because the diaphragm in the expansion vessel is either perforated or the vessel needs recharging with air. bike pump required!
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