yes both valves shut off, but i cant be certain they are not letting some water in. It would be impossible to say, but they are not old and in good condition.
Could be weeping from the pressure relief valve,a leak on your system,or more unusual,a leak on your heat exchanger.After 5 days of not using the central heating the boiler is still loosing pressure. I am pretty sure this indicates the leak is on the system somewhere. Is this correct? We have used the hot water only this lat week. Initially the pressure held for longer, but it looses pressure very quickly once you get down to 0.8 bar.
Well i got a fair bit of black little bits in there. sure looked like magnatite.
These can be isolated using gate valves in my utility cupboard.
The PRV is not leaking.
If the heat exchanger would i see any water in the boiler ? There is no sign of water in there.
Does this give any better clues on what is happening with my system? There are still zero leaks in the house. Nothing is showing up.
Hi all again.
I still have this issue as have just been to busy to get it sorted.
Recently we havent had the heating on and just used hot water. The boiler held its pressure at 1 bar for a good 10 days.
We put the heating on this week and i topped up on monday to 1.4 bar. This morning it was down to 0.2 bar. So it has lost a lot of pressure this week as it has been used most days now it is colder.
I am now 100% certain the issue is not on my new extension loop. This is good news for me.
So the issue is in the main house on the copper system. This was put in by the previous owner and i think it was done in 1990. So 30 years old. 22mm copper feeding runs of 15mm.
In the next 2 weeks i am going to drain down and fit a new magnaclean 2 and also add a leak sealer. I know this is a bad idea but i cant see any other way to find the leak. If this doesnt work then the issue must be on the boiler
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