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my ravenheat boiler keeps losing water pressure?

my ravenheat keeps losing water pressure[normily runs on one bar]

les
December 2009
RavenheatHeating, Home Heating SystemsBoiler Water Bar
water leaks from my pressure gauge. Why is this? Also i keep loosing water pressure and keep having to add pressure to keep it above 1 bar

Dave Prince
January 2010
The expansion vessel may have lost its pre-charge,
easy job to complete, pumping the vessel back up.

or

Connection to vessel may be blocked and therefore the
vessel is unable to take up the expansion of heated
water, PRV (pressure release valve) dripping outside.

Steven
January 2010
your ravenheat or central heating system has a leak!, usual suspect is the pressure relif valve this passes thro the wall to out side can can drip if there is dirt in the system or if there is a pressure fault, tie a polythene bag over the end and if there is water in it the next day.... it's leaking!

The Plumber
December 2009

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