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  1. M

    Increasing Water Pressure On A Ferroli Optimax HE31 C

    Thank you very, very much, mate.
  2. M

    Increasing Water Pressure On A Ferroli Optimax HE31 C

    OK, so I should leave the blue levers pointing along the valve and turn both the black knobs until fully open?
  3. M

    Increasing Water Pressure On A Ferroli Optimax HE31 C

    Hello Folks, Our boiler has gone out with the error code of F37 and the pressure gauge is sitting at zero. I'm trying to fill it back up and have tried the 2 blue levers in both positions and in every combination I can think of. Next to the levers are 2 black knobs which I have turned when...
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