I have a Baxi combi boiler (installed just over a year ago) and it has ran fine (opperating around 1.5-2bar) up until the 1 year warranty ran out (sods law!). Now when the system is off the pressure goes right down to 0bar. When I turn the heating on it goes up to 3bar. I have checked for leaks and bends/blocks in the flexi pipes (which there aren’t any) and also bled the system. When I turn the heating on (from 0bar pressure) the boiler makes cluncking sounds. Anyone have any ideas before I fork out a tonne for the plumbers? Thanks
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5 Responses to “Why does my combi boiler pressure shoot up to 3bar?”
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Could be a faulty pressure gauge. Have you tried topping up the system will the fill loop (the flexi pipe with a tap on it) to see if the system pressure increases. If the pressure gauge increases & then slowly drops then this would normally indicate a leak in the system. If the gauge stays steady then all is well. If the system pressure exceeds 3-4 bar then normally it will self vent using a safety valve incorperated within the boiler. Have you shut off a number of radiators which could increase system pressure when the boiler is firing? Failing that……bite the bullet & pay for a pro to sort it out. Hope you get it sorted.
plumber here , if your system is a pressure system ( a little red cylinder ) then your pressure should alway’s sit at 1 bar , if all rad’s are heating and vented then there are no blockage’s , i can not think of a reason for your problem . before you get a plumber i know they can be dear over in england , get in touch with the heat advice council i think it’s free and see what they say.
as above the safety valve will blow at 3/4 bar to stop your system getting damaged
Have you checked your expansion tank to make sure its not waterlogged?
The previous owners to this property had a similar problem. When the plumber came he found that the valve on the filling loop was open when it should have been closed. Don’t know if this helps
Pressure vessel fault ?
Big red thing
Call in boiler maintenance folk.