Noise Vibrating Gloworm Ultracom 38cxl Boiler

Joined
21 Apr 2008
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United Kingdom
Boiler works ok but after about half an hour or more it suddenly makes a noise which sounds like vibrating and I can hear the sound also in the radiators. The sound will stop of it's own accord after ten mins or so but sometimes start up again.

I have found if I just turn the hot water tap on for a second it will stop making the noise.

I have bled the radiators twice and no air in them. The system is only two years old and recently serviced.

Any ideas what is wrong? I can't understand why the boiler works fine and just kicks in with that sound after about half an hour - what is triggering that?
 
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