Ravenheat whistling noise

19 Mar 2018
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United Kingdom
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 ?
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