Odd boiler pressure issue

[Madrab]

2yr old .... should still be under warranty??

 

[ianmcd]

2yr old .... should still be under warranty??

if it was ever registered

 

[Madrab]

if it was ever registered

Very true

 

[Ali Ahmed]

Warranty expired October 2020

 

[Ali Ahmed]

Suggest you repeat the test tonight...

1. Start with a cold boiler.
2. Top-up to 2 bar.
3. Isolate ONLY the heating flowand return pipework.
4. Switch off the boiler.
5. Review in the morning

Done exactly as you said.
In the morning the pressure was zero and there was not a drop of water from either pipes.

 

[ianmcd]

and what happened when you opened the isolaion valves after your test ? did the pressure jump back up ?

 

[Ali Ahmed]

and what happened when you opened the isolaion valves after your test ? did the pressure jump back up ?

Pressure remained at 0 so I had to manually top it up.

 

[terryplumb]

As already advised ,your leak is on the system not the boiler.

 

[Ali Ahmed]

As already advised ,your leak is on the system not the boiler.

Is there any way of identifying where the leak is without ripping up fllorboards and walls? Is there a way to test one set of pipes at a time?

 

[ianmcd]

Pressure remained at 0 so I had to manually top it up.

The leak is on your system, if it wasnt leaking the pressure would have went up a bit when you opened the isolation valves

 

[terryplumb]

Water leaks on upper floors would inevitably be visibly apparent. Leaks on ground floor ,pipes buried in concrete etc are far more difficult . You should make a thorough inspection around any area known to have pipes buried ,looking for any tell tale signs or damp areas .
There are specialist company's / equipment for leak detection if
all else fails ,as they are not cheap.

 

[Ali Ahmed]

Water leaks on upper floors would inevitably be visibly apparent. Leaks on ground floor ,pipes buried in concrete etc are far more difficult . You should make a thorough inspection around any area known to have pipes buried ,looking for any tell tale signs or damp areas .
There are specialist company's / equipment for leak detection if
all else fails ,as they are not cheap.

I already checked all visible pipes. There's no wet patches on any ceilings. Radiators are all dry. This leaves ground flooring. I suspect it could be the pipes ubder the dining room floor boards. That rood was converted 3 years ago and builders installed new pipes and radiators.

 

[terryplumb]

I am afraid lifting floor boards up would be the next step . What area has concrete flooring with buried pipes in concrete ?

 

[Ali Ahmed]

I am afraid lifting floor boards up would be the next step . What area has concrete flooring with buried pipes in concrete ?

The only place with floor tiles is the kitchen. Otherwise rest is floorboard.

 

[Ali Ahmed]

Us there any way to test if the boiler isolatiin valves are not closing fully allowing the mysterious water to run back down to the system.