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Boiler pressure rising indefinitely when heating is on

Discussion in 'Plumbing and Central Heating' started by Audronius, 27 Sep 2020.

  1. Audronius

    Audronius

    Joined:
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    Country:
    United Kingdom
    Hello,

    Recently moved to a new rental place. The Vaillant EcoTec Pro 24 boiler was empty (I think for quite a while), refilled it via the loop to 1.5 bar & bled the radiators to remove any air.
    One of the valves (the smaller handle) in the filling loops leaks very slightly but I don't think it's related.

    The issue - when the heating is on the pressure goes from 1.5 bar to 3.9 bar (max on the scale) in about 15 minutes.
    I didn't notice it the first time & found the boiler with an F.22 error after an hour. Restarting the boiler at the fuse cleared it up. The next day I emptied & refilled the system again - same thing, but turned off the heating when it hit 3.2 this time.

    - Turning off the heating when it's above 3.5 bar it drops back to below 2 bar after an hour or so
    - Radiators (3 total) do heat up like they should during the test.
    - Both the water & radiator temp is set at 60C, hot water comfort mode is on.
    - Hot water works ok when heating is off - pressure doesn't rise when e.g. showering and nothing else abnormal noticed.

    Is there anything else I can do or check before going to the landlord about this?
    And thank you, this forum is a lifesaver!
     
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  3. ianmcd

    ianmcd

    Joined:
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    Location:
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    Your boilers expansion vessel needs re-charging/replaced, you will need to get your landlord to arrange this
     
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