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I'm not fully sure if there's an existing bypass, but the two new radiators were put on the existing bedroom circuit, so to my novice eye nothing complex was done. There is however something labelled as a balancing valve next to the pump

We recently had two new bedrooms put in the loft, each with a radiator. In the past two days, a loud humming noise has started from the heating pump in the airing cupboard. During boiler-on (hot water and/or CH) the pump is silent, it only emits the loud humming noise immediately after the...