hi there i have a worcester 240 combi boiler that is blowing its pressure release valve at just over 3 bar
hot water is all ok
the boiler pressure when cold is always and has been 1 bar
it does not loose any pressure, only when the boiler is in central heating mode does the pressure keep climbing until it blows the prv
have read the faq's/search pages so i know its something to do with the expansion vessell pressure(big red tank)
when i tested the inner value on the vessell there was No water coming out from it just a little bit of air----so i think i need to put some air in with a foot/bycicle pump.
but how much do i put in please if my needle is set to 1 bar on the gauge??
do i need to drain the boiler first of the water in it, so pressure is at zero then pump up the expansion vessell???
what is the correct and safest way
PS
i am a qualified electronics engineer and have fitted a diverted value and overheat thermostat and a fan unit in the last 9 years,so used to taking it apart,but want to make sure i do it correctly
step by step help would be very helpfull if someone could take me through it
many thanks in advanced
hot water is all ok
the boiler pressure when cold is always and has been 1 bar
it does not loose any pressure, only when the boiler is in central heating mode does the pressure keep climbing until it blows the prv
have read the faq's/search pages so i know its something to do with the expansion vessell pressure(big red tank)
when i tested the inner value on the vessell there was No water coming out from it just a little bit of air----so i think i need to put some air in with a foot/bycicle pump.
but how much do i put in please if my needle is set to 1 bar on the gauge??
do i need to drain the boiler first of the water in it, so pressure is at zero then pump up the expansion vessell???
what is the correct and safest way
PS
i am a qualified electronics engineer and have fitted a diverted value and overheat thermostat and a fan unit in the last 9 years,so used to taking it apart,but want to make sure i do it correctly
step by step help would be very helpfull if someone could take me through it
many thanks in advanced