Central Heating - Losing pressure

Joined
24 Oct 2017
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Hi All,

I have seen a few similar threads, but thought it best to start a new one as they spoke about megaflow systems and we have a Joule Unvented cylinder.

We had the unvented cylinder installed a few months ago and all the pipework redone in the house, however there was a few months gap before we had the new rads fitted, whilst we had the plastering done.

The system has never really worked properly, I fill it with the filling loop and after a few hours it is back to almost zero.

I know that it could be a leak but I have looked everywhere and have seen no sign of any leaks. This has been going of for a few months now so I think I would have noticed that much lost water (but I could be wrong).

This may be normal, but sometimes it sounds like the boiler drains, and a load of water goes down a pipe from the boiler, outside and under ground.
I am not sure if this is happening but it might give a clue?

Any ideas about why this is happening would be much appreciated.
 
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