Have you bled radiators recently? If so then it could well be because of that, if not it might be worth considering as there may be air in the system that got released from where it was for some reason.
Failing a source of less pressure from air being removed from the system many boilers will have some form of balloon or vessel which will moderate pressure if it gets to high and release the excess. These are very prone to breakage and if e.g. the diaphragm in the middle (for some designs) breaks it can just release pressure anyway. It often fails when it's been off for a while and then the boiler restarts.
I don't think you can cause much issues by refilling the boiler at least once so I would suggest:
1)bleed radiators, if no air present go to 4) 2)repressurise 3)if it depressurises then assume result of 1) 4)repressurise 5)if it looses pressure again contact competent boiler person and say that you think it might be the pressure relieve valve blown in some way.
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February 13 2011, 14:45:37 UTC
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Failing a source of less pressure from air being removed from the system many boilers will have some form of balloon or vessel which will moderate pressure if it gets to high and release the excess. These are very prone to breakage and if e.g. the diaphragm in the middle (for some designs) breaks it can just release pressure anyway. It often fails when it's been off for a while and then the boiler restarts.
I don't think you can cause much issues by refilling the boiler at least once so I would suggest:
1)bleed radiators, if no air present go to 4)
2)repressurise
3)if it depressurises then assume result of 1)
4)repressurise
5)if it looses pressure again contact competent boiler person and say that you think it might be the pressure relieve valve blown in some way.
What type of boiler is it anyway?
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No advice, that's beyond my 'argh, phone the landlord' point. But lots of sympathy.
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