Out of fresh ideas and no1 knows lol Ahh HELP

[Daveleaver]

Alright everyone

Posted on here ages ago got fantastic advice and a boiler recomenedation.

This is the story

All new rads x5 with old pipework and combi. Had a poor ideal isar he30 boiler loosing pressure.

Isolated rads from boiler which is in the loft so highest part of the CH system. Turned out it was the boiler loosing pressure so got a ideal logic plus installed.

Last week no dhw chexked pressure and guess what 0bar. So pressurised to a bar and isolated the rads again within 18 hours dropped from 1.0 to 0.8.

I have contacted the guy who installed it were trying to arrange a day to check it out as i crazy hours and live alone. Surely this is more than coincidence that both boilers were loosing pressure gradually this boiler is loosing it slower. It has been going on for a total of 6 months now new boiler only been in 3 weeks.

I am so confused how this could happen leak is defo on the boiler side.

Thanks

Speak soon

Dave

 

[Last Plumber]

Could be a leak on system, could be corrosion ( doubt it with new rads but it's not impossible).
Installer will be able to tell you

 

[townfanjon]

Its a longshot pal there could be a problem with the new boiler, but it will obviously be covered by warrenty if it is.
If the leak is on the system, a very very small leak will drop the pressure .

 

[Daveleaver]

Hi

Appreciate the replys. Whe i isolated the ch the boiler drops pressure and when putting the rads back on the system it doesnt drop. Its always onlt the water out the boiler until the pipework below so last week when it done it i didnt repressurise it for 2 days cos i was away for the weekend and wanted to see when i got back if the towel radiator was full as this is the highest radistor in the house and it was no air nothing as soon as i open the bleed valve water no air.

Its so odd

 

[Chalked]

1.0 bar to .8 can just be expansion and contraction. Top the boiler to 1.5 when the system is cold, vent all radiators, then top up again. Monitor this pressure and see if it drops. Don't forget it will rise, when the heating is hot.