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viessmann 222 combi

Bill_44 Member Posts: 4

Getting an F3 (Combusion control) fault; resets @ "R". changed ionization & igniter. What else to check?


  • psb75
    psb75 Member Posts: 847

    Clean the heat exchanger. Check the condensate trap. Basic yearly maintenance.

  • GGross
    GGross Member Posts: 1,075

    F3 is a weird fault, flame is already detected at burner start, you need to check the flame sensor and cable. I would contact tech support for that one.

  • Derheatmeister
    Derheatmeister Member Posts: 1,555

    Static Gas pressure..Running Gas Pressure.Basic maintenace such as cleaning both rods.Make sure the polarity is correct including propper ground !