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Hi All, Thanks for all your replies. I think I had a problem with water pressure, which was making that humming noise, the original installer told us to run the water pressure at 2 bar, when this should have been only 1 bar. We don't have a vertical flue, but have tried several of your ideas...

Hi Everyone, I'm a complete newbie, so be gentle with me please! I had an Ideal Isar 24 (Oh dear) installed by Warmfront some 18 months ago. It now seems to be humming, sounds like an aircraft that is stuck in a time warp. It is intermittent, and the hum can last for up to 15secs, but that...