Hello Philip,
I cant comment on the volume of the noise but your dealer is correct about the function.
You have a water system controlled by a pressure switch. When you first fill your system the pump operates and when you turn of all the taps OFF the pump continues to operated for a few momemts as it increases the pressure in the pipework. The pressrue switch senses this and when a threshold pressure is met the pump is turned off.
when you want water, you open a tap. The pressure is released , and the switch will sense the drop in pressure and turn on the pump.
If you only half open a tap, the pressure drops, and the
pump turns on, however as it is capable of pumping more water than the tap will allow to pass the pipe work becomes pressurised, and depending on the flow the pressure switch may become satisfied and turn the pump off. This can happen quite quickly (2 to 4 times s second), and is quite normal.
If you follow the pressure switch instructions, you may be able to reduce the switching, but you may also affect the flow or the pump may not be able to reach the pressure set on the switch. Trial and error
A word of warning, the water pump needs an actual flow of water through it to help to keep them cool. If you set the pressure switch too high, the pump might not be able to develope enough pressure to trigger the pressure switch. A pump that runs without any water flow will begin to wear out very quickly, and it may actualy melt its own plastic casing.It is almost as bad as running in dry air.
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