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Problem now solved, very simple, a partially block gas injector which was then shutting the boiler down causing the circuit board constantly try try to relight boiler. Thanks for advice.

Yes all trv set to 6,

Silly question but what Are TRV's?

I have a problem with my boiler it will not give a constant supply to the radiators, once the room temperture reaches 16 deg C the radiators cool even thou the room thermostat is set to 21 degC, Also the hot water only reaches a warm temperture. All the pipe work and radiators reach very hot...