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Hi can anyone explain how to tune a boiler by site of flame.

hi i seem to have hot air escaping on the left side of burner making the pump get hot between collar and flange, i have replaced the gasket between boiler and flange, but it didnt make a difference so i know its leaking between the flange and collar any ideas?

Hi please help. My Riello 40 burner lockes out the motor trys to turn but just buzzes and then locks out. I have replaced motor and pump with new ones but guess what it still does it. Please help i have spent loads of money on this thing now. The only way i can get it to start is by pressing...