boiler loosing pressure
- Thread starter Big Uli
- Start date
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Is water discharging from the overflow outside, by any chance?
John
John
Combi boilers have a pressure release valve that is built in......typically if the water pressure reaches 3 bar , the relief valve opens and allows water to spurt outside - its a safety measure. What often happens is that owners overpressurise their boiler, the valve opens but doesn't always fully shut again, maybe to a tiny bit of dirt stuck in the seal.
The valve may seal itself if you raise the pressure, but if it doesn't its necessary to replace it.
If the pressure continues to drop, its a good bet that the valve is still passing.
John
The valve may seal itself if you raise the pressure, but if it doesn't its necessary to replace it.
If the pressure continues to drop, its a good bet that the valve is still passing.
John
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Still allowing water through, then......if you pressurise up to the lift off point, the valve will open, maybe the problem will flush away and then the valve may seal again.
If it does, then you'll have to reduce the pressure by bleeding water away from a nearby radiator.
The alternative is to keep topping up until someone can give you a call. However, there's been a fair bit of fresh water introduced into your system here which isn't really desirable as the inhibitor will be diluted somewhat.
Life's never simple
John
If it does, then you'll have to reduce the pressure by bleeding water away from a nearby radiator.
The alternative is to keep topping up until someone can give you a call. However, there's been a fair bit of fresh water introduced into your system here which isn't really desirable as the inhibitor will be diluted somewhat.
Life's never simple
John
I've had the plumbers out and they replaced the release valve. Pressure is still dropping though if the heating is one.
When re pressurising the boiler water does leak out from underneath it. Sometimes more, sometimes less.
Could that be another symptom of anything going wrong?
When re pressurising the boiler water does leak out from underneath it. Sometimes more, sometimes less.
Could that be another symptom of anything going wrong?
Yes.
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Very common on these and nothing to worry about normally. If you look up under the boiler while filling it, the water is probably dripping out of a little brass hole a bout 5 or 6 inches from the filling handle, if it stops after a few minutes thats ok, its not your problem.
Get your boiler while the heatings off, fill to 1 bar or 1.5 bar while the systems cold, then run your heating till all the radiators are nice and hot, then turn heating off and tell us what the pressure reading is then.
Thanks
Just did and pressure is 1.9 with boiler still running
Will check again in 5 minutes and update the topic
I wasn't here when it was done as I was working out of town
I would hope they did
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Sounds ok, its not getting near the set off pressure (3bar ish) for the PRV, which sounds like expansion vessel is ok.
Possible leak at a radiator valve or under floor.
Possible leak at a radiator valve or under floor.
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