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Thanks for the quick reply Tony, sounds like there's no quick fix and I need to call out an engineer, I'll get on to it. Cheers.

Hi folks, We have just moved in to a one bedroom cottage with a Viessmann Vitodens 100 condenser boiler with a Grundfos 3 speed heating pump which at present is on the middle speed setting,the pump is quite noisy and I'm wondering if it's safe to turn it down to the slower speed and will that...