Recent content by HairyHector

Update: The noise isn't coming directly from the pump. It comes from the boiler. (3-4 short bursts of low humming shortly after the pump starts). I've reduced the pump speed to 1 which has significantly reduced the noise. This has also allowed me to fully bleed the system of air so I presume...

Hi. Last year I had a new Bosch 15 ri boiler fitted and I've noticed that when the room stat kicks in and the pump starts up, it almost sounds like it has to have 2 attempts to start up before getting going. There are two short bursts of a low buzzing noise (the sort of noise an electric...