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    Ferroli optima 901 fan not runing at high speed no ch or hw

    Hi All, optima 901 i have a pilot light so thermocouple is ok the hw and ch flow temperature sensor are both reading 900 ohms or there abouts (before running) so should be ok but on runing the hw tap the boiler fires but soon backs off with yellow flames due to the fan not kicking in on high...