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OK thanks, guess i'll have to ring someone Monday.

Thx for your response. Would a lack of water flow also cause boiler not to falme up properly as I have noticed that water pump does not kick in either. Dont know if that's because of boiler flame been low or the cause. Its a WILO GOLD 05 pump, is there any easy way to check it?

I have a fanned balanced flue Ideal gas boiler and Siemens MAV322C 3port motorised valve arrangement. When HW, CH or both selected boiler fires up but only with a small flame (it use to roar into life) water not getting hot. Motorised valve actuator head (motor) had been making a whining...