chrishutt said:That's proof that there is a leak fault on the boiler...
Quite so.chrishutt said:I'm puzzled that the pressure didn't rise slightly when you opened the isolating valves, if the system (external to boiler) pressure had remained at 1 bar. You might also have a minor leak there.
This doesn't seem conclusive evidence to me - did the water that you believe passed through the closed isolating valve(s) drip from the rad vent?rwalters said:The isolation valves are obviously "passing by". I pressurised the system to 2bar, closed the isolation valves and let water out of a radiator upstairs. Came back downstairs and the boiler pressure has dropped, so one or both of the valves are not sealing properly.
Softus said:This doesn't seem conclusive evidence to me - did the water that you believe passed through the closed isolating valve(s) drip from the rad vent?rwalters said:The isolation valves are obviously "passing by". I pressurised the system to 2bar, closed the isolation valves and let water out of a radiator upstairs. Came back downstairs and the boiler pressure has dropped, so one or both of the valves are not sealing properly.
At this point you don't know whether the valves leaked or the boiler leaked.rwalters said:Opened isolating valves
Pressurised system to 2 bar
Closed isolating valves
Bled radiator upstairs until water just trickled
Went back downstairs, boiler pressure dropped by about 1 bar
No - this is still inconclusive.rwalters said:Surely, if the valves were remaining sealed and closed, the pressure on the boiler side should have stayed constant, but only dropped when I re-opened the valves.
I agree, now that you've said how long it took!rwalters said:The boiler, under normal circumstances takes about 24 hours to loose .5 bar of pressure, with the test I just did, it dropped by 1 bar straight away, within minutes, so the isolation valves are not doing their job properly are they ?
ididdidi said:Just a quick observation you are closing the correct valves on the flow and returns and not say a return and gas isolation valve which would give the same results that you are getting.
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