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Firebird C35 Condensing Boiler

  • 06-06-2024 04:44AM
    #1
    Sheryl1971
    Registered Users, Registered Users 2 Posts: 12 ✭


    I have a C35 condensing boiler operating 1 manifolds around 18 kw, 1 manifold around 11kw, 11 radiators, 4 towel rails & trench heating. My issues are as follows

    1: Boiler overheats

    2: Boiler struggles to get to set point and if finally reaches set point, flow will increase by 10C

    3: Boiler cycles on and off every 2 mins

    4: Boiler blows water out the condensate pipe, dries out the trap and melts the condensate pipe.

    5: On the flue analyser the settings are as follows: Danfoss nozzle .65 80S, 12 Bar, Air 5, CO2 12% flue gases 134C, excess air 43%.

    Can anyone help me as to what is causing all these issues please. UFH manifolds run 80% of the time there is no buffer tank of LLH on the system.

    Post edited by Spear on


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