2nd floor rads not heating up

Discussion in 'Plumbers' Talk' started by HERSHAM BOY, Feb 16, 2021.

  1. HERSHAM BOY

    HERSHAM BOY Member

    The radiators (towel rad + radiator) in my loft conversion won't heat up.

    I have an S plan system and an megaflo next to the boiler in the ground floor garage.

    5 Zone valves. Each zone in 22mm and 15mm to each rad.

    Ground floor
    1st floor
    2nd floor
    Megaflo
    UFH

    When all valves are open the loft rads stay cold. The only way I can get the loft rads to work is by closing all valves and only opening the 2nd floor zone valve then they work perfectly.

    I've tried balancing and even turning off rads in unused rooms but still no luck. Any help greatly appreciated. 1.5 bar pressure.
     
  2. HERSHAM BOY

    HERSHAM BOY Member

    Does anybody have any suggestions?
     
  3. ItchySponer

    ItchySponer Member

    Probably pipe size / restriction issue unless the pumps undersized.
     
  4. HERSHAM BOY

    HERSHAM BOY Member

    It's 22mm flow/return and 15mm tee to each of the two rads.

    The it is a Worcester junior 28i Combi.do you think the pump could be undersized/faulty?
     

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