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  1. Jock_Meyer

    Ferroli sigma 60-100 only works when thermostat disconnected and reconnected

    Morning everyone. I've got a problem on a ferroli sigma 60-100 and was wondering if anyone could share some hindsight. On demand of CH+HW or any of them the pump runs, but boiler doesn't start. Main PCB and gas valve PCB were sent away for testing and all came back good. Replaced safety...
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