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Thanks for all your comments In answer to the questions: The sound only occurs when running the hot water. The noise starts high and then drops in tone, disappears and then starts high again, just like a small plane flying past. Interestingly enough, we haven't used the central heating...

Thanks for the advice! I had a quick look and it seems to have been a dodgy contact on the leads to the Gas valve so that's working fine now. Have you got any idea on it sounding like an aeroplane? Could it be that the system needs some sort of additive to reduce noise? Thanks Jon

Hi all, We've got a Heatline Vizo 24 Combi Boiler at home installed at the end of 2006. It has been running fine up until recently. It now only works intermittently. It'll work one morning and then it won't be working in the evening or vice versa and any variation on this. When it...