Pressure loss - not sure why

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Robin37

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Hi everyone. I'm hoping someone can help please.

Recently a pipe came off one of our radiators (long story!), water everywhere - but not all the water in the system came out. Pipe fixed, no more leak. Had to top boiler up a couple of time, understandable.

However, we have kept experiencing pressure loss - goes from 1.0 bar to .8 bar over a week, consistently. Pressure gauge is not going high and can't see any water coming out of outlet pipe. Radiators have been bled.

I know the obvious answer is - there's another leak, but, the boiler (Gas combi) had worked perfectly for the entire 18months prior(new install), no pressure loss, nothing - until this recent leak. I've checked all valves for leaks, no patches on ceilings. If it is another leak it's a huge coincidence.

Just wanted to ask for some advice on here before getting someone out, so I have a bit of of knowledge behind me.

Thanks in advance.
 
Aav inside the boiler could be weeping. (if it has one) heat inside the boiler evaporating the drip away before it shows outside the boiler casing.
Absolute guess
 
Thanks for replies. I was so hoping it's not a leak. As if one wasn't bad enough! Might have to be an insurance job to find it I think
 
Did the person doing the repair use the boiler prv to drain the system? If so it is probably dribbling out of the pressure relief valve.
 
No, the system was not drained when original leak occurred. Pipe came off, dumped water everywhere and then stopped (does a vacuum/airlock form somewhere? Not sure of this), pipe re-attached and system re-filled from filling loop
 
Thanks for your input everyone, much appreciated. I just wanted to rule everything out before going down the leak route ☹️
 
An update - after much searching, plumber found the leak - was a pinhole from old copper pipe dripping onto main flow pipe which was drying it up - thus no ceiling mark! All fixed now and hopefully that's the end of it.

Thank you for all your help (y)
 
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