1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Central heating misery (or mystery)!!

Discussion in 'Plumbing and Central Heating' started by 3ndlessdreamz, 4 Mar 2020.

  1. 3ndlessdreamz

    3ndlessdreamz

    Joined:
    4 Mar 2020
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi hope somebody can help! We've had our open system boiler upgraded to a Viessmann Vitodens 050 combi back in August last year. When we had the heating on the first time in November when the thermostat was set to 20℃. After giving birth and having parents coming from the far east to help out, we needed a warm house, and everything was fine and dandy.
    However the nightmare started when my parents left and we turned the thermostat down to 18℃ and the system was allowed to cool between fire ups, and we've had to top the pressure up twice a day!
    We've had a local heating engineer checked all the radiators and valves and they weren't leaking. The company that installed the boiler checked the boiler and it isn't leaking. So we isolated the boiler and it wasn't the boiler, the pressure dropped from 1 to 0.2 bar when we opened the CH valves back up.
    The only time we seem to have a drop in pressure is when the CH is cooling or cold, because I've literally topped up the pressure and had the heating on for 5 hours and no drop in pressure. And there are no damp patches on the ceiling anywhere. Any ideas?
     
  2. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    11,387
    Thanks Received:
    2,326
    Location:
    Daventry
    Country:
    United Kingdom
    Do you have any pipework under the floors downstairs? That would be a good place to start
     
  3. 3ndlessdreamz

    3ndlessdreamz

    Joined:
    4 Mar 2020
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    That's what the installer and heating engineer both think, just the hassle I suppose!
    But what I don't understand is why is the pressure dropping when it's cold and not when it's hot??? Surely if I have a leak it'll leak even when it's hot???
     
  4. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    11,387
    Thanks Received:
    2,326
    Location:
    Daventry
    Country:
    United Kingdom
    That's just how it is sometimes. Things expand and contract as they heat and cool
     
    • Thanks Thanks x 1
  5. Sponsored Links
  6. 45yearsagasman

    45yearsagasman

    Joined:
    14 Mar 2010
    Messages:
    6,074
    Thanks Received:
    1,083
    Location:
    Norfolk
    Country:
    United Kingdom
    Pressure vessel been checked?
     
  7. 3ndlessdreamz

    3ndlessdreamz

    Joined:
    4 Mar 2020
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    Not sure, but the PRV was dry when the installer came to check yesterday...Also the pressure didn't drop when the boiler was isolated
     
  8. wwwebber

    wwwebber

    Joined:
    5 May 2004
    Messages:
    423
    Thanks Received:
    23
    Country:
    United Kingdom
    Pressure whilst hot and running should be approx 2 bar, then dropping to approx 1 bar when cold. What are you seeing that is different ?
     
  9. 3ndlessdreamz

    3ndlessdreamz

    Joined:
    4 Mar 2020
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    The pressure doesn't rise more than 0.2 bar when it's hot, and when it's at 1 bar it can stay like that for a very long time until suddenly it'll just start dropping at 0.2 bar per hour usually middle of night or early morning
     
Sponsored Links
Loading...

Share This Page