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    PowerMax 155 - Whirring noise on start-up?

    I have a PowerMax 155 boiler (IMI Range) which makes a a loud whirring noise when the burner kicks-in first thing in the morning to heat up the water and the radiators. This resonance which sounds like a constipated cow moo-ing! - lasts for about 5-10 seconds before it quietens down The system...