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Discuss System pressure circulation issues in the Central Heating Forum area at UKPlumbersForums.co.uk.

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  1. Funky dog

    Funky dog New Member

    If you have a weak circulation pump inside a combination boiler, will this cause the pressure of the system to rise? Eventually making the system over pressurise . The radiators get hot but it is only a small circuit with very small radiators so even with the boiler thermostat turned right down all radiators in the property get hot really quickly.
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    No
     
  3. king of pipes

    king of pipes Trusted Plumber GSR

    Time for a service Mr dog
     
    • Agree Agree x 1
  4. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Noooooo
     
    • Funny Funny x 1
  5. Brambles

    Brambles Active Member

    If the pressure is rising significantly on a hot system then it is probable that there is insufficient ( or failed) provision for expansion in the system
     
    • Agree Agree x 1
  6. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Brambles, please familiarise yourself with the forum role as the information you provided could potentially be deemed pertaining to the DIY repair of the boiler
     
    • Like Like x 2
  7. Funky dog

    Funky dog New Member

    It’s a halstead combi boiler with a extra external expansion vessel that’s been fitted on the return side of the heating Circuit. The pump is internal and has a weak pump. If the pressure was set to one bar it rises reasonably quickly to 2 bar I’ve been told it was a new expansion vessel recently fitted.
     
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Does it continue to rise or plateau?? Pressure will rise when heated. Anything else you are guessing. Weak pump is inside boiler so needs a GSR engineer
     
  9. Funky dog

    Funky dog New Member

    Thanks I’ll call an engineer I think.
     
  10. Brambles

    Brambles Active Member

    Worth having a good look at the system, outside the boiler casing, to understand why an external expansion vessel has been fitted.
     
    • Like Like x 1
  11. Last Plumber

    Last Plumber Trusted Plumber GSR

    How do you know the pump is 'weak'?
     
  12. Funky dog

    Funky dog New Member

    Removed the cap and it stopped with a slight touch with a screwdriver
     
  13. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Right as has been said. Pump inside boiler. You are now in the realms of needing a GSR so please respect the forum rules and dabble no further.
     
    • Like Like x 1
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