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High noise on Ferroli optimax HE 31c?

When the boiler runs in a low fire, it's make a high vibrating noise for 1 minute, then it's working ok, but when the thermostat lighting again, the noise start again. Any idea why? Thank you

Marcelo
March 2010
FerroliHeating, Home Heating SystemsBoiler Runs Fire
sounds like the gas valve just needs adjusting on min setting .to get the gas and air mixture perfect when fisrt firing up ,normally on ch not hw .if you have your 5 yr warranty still fone ferroli o8715592924

ferroli engineer
May 2010
i would suspect the gas mixture is incorrectly setat minimum output. It will either require adjusting or possibly a new gas valve

fer eng
March 2010
low gas rate may need adjusted

Ian
March 2010

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