boiler hunting off on

My Raven-heat boiler switches on and fires at full power. It switches to a lower flame level as it should but two or thee seconds later I hear a switch and the gas switches off.
A few seconds later it reboots as above.
As the air fan and pump continue, it is clear that I am blowing the heat from the centrally heated water out to add to my global warning and wasting my money.
I think that this is a safety system which has gone wrong.
Advice please
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