ᐅ New heating system (underfloor heating) in the new build is making a terrible noise!

Hello everyone,
In our new multi-family house, we are having some issues with the heating system (pellet boiler with underfloor heating). The supply temperature of the underfloor heating is correct after a maintenance service.
However, now the underfloor heating is making a terrible rushing noise, even at night.
When I briefly close the valve in the distribution box, the noise stops.
Before I contact the heating technician again, I wanted to ask for some advice here.

Could it be that the heating system was refilled recently and there is too much air in the system?
Or why is the underfloor heating making this noise now? It was whisper quiet before the maintenance....
Nothing has been adjusted at the distribution box in my apartment, not even the room thermostats or anything else.

Thanks in advance!

How much has the supply temperature changed? What was/is the return temperature? It is possible that a higher flow rate has been established, which is now causing noise.

Bieber0815 schrieb:
How much has the flow temperature changed? What was/is the return temperature? It’s possible that a higher flow rate is causing the noise now.

Hello.
The flow temperature of the underfloor heating is now lower than before, around 35°C (95°F) in the boiler room and about 23°C (73°F) in my apartment.
The circulation pump was replaced and possibly readjusted.
But it also seems that water was added to the system, as there is a water hose lying in the boiler room...

Do I have to accept this noise, or can I make a complaint?
I am the owner, and the heating system is less than one year old.
Thanks

If the pump pressure is set too high, it causes noise... since the pump was also replaced, that’s likely the reason... just my opinion as a non-expert.

What type of heating system and circulation pump do you have (Grundfos?)?

I would try lowering the pump pressure and see if that improves the situation.

Perhaps the flow rate had to be significantly increased because the supply temperature was lowered. Somehow, the energy still needs to be transferred.