If the noises continue after you have taken the previous actions there is a possibility that the problem may lie in the circulation pump.
Boiler water pump noise.
Adventures in living 5 306 views.
Came out to the pump on the boiler making a weird noise.
Why a central heating pump might be noisy.
Recirculating hot water pump noises duration.
If the boiler has an option to slow it down this may solve the problem.
Frank burstein 23 views.
In most cases the central heating pump can be found pretty close to the boiler so that it can begin pumping the water as soon as the boiler is done heating it up.
If the well pump is a submersible unit located inside the well normally the only noise you ll observe in the building is the clicking of the pump control relay s that turn the pump on or off and possibly a modest sound of water entering the water pressure tank or building piping.
If the humming stops and you want to keep the pump set at a lower speed just check that the radiators heat up properly and the boiler isn t cycling too fast.
Check the circulation pump.