Ravenheat whistling noise

[Ali26]

Hi folks,

I have a Ravenheat RSF820/20 boiler in my flat. Recently it started making a whistling noise when it passes 2 on the pressure gauge. I bled the radiators until the pressure went back to 1.

Immediality after opening the boiler, the pressure is past 2 again and is making the whistling noise.

Anyone know what the problem is ?

 

[Madrab]

It needs a service and they should check the EV at the same time.

 

[Deleted member 221031]

It’s calling it’s mothership.