worcester 28i junior condenser boiler

[Amandaankids]

Hi, my heating and water are not working, at the boiler the lights are flashing, when the reset button is pressed all seems to start to work as normal but after aprox 30-40 seconds it shuts off and the problem starts again, I have checked the flue no blockage and this time my pipe is not frozen, water pressure is ok ignition is ok I've turned it all off and restarted it but still the same, can anybody help
Thanks

 

[holty]

whats the sequence of the flashing.

 

[Amandaankids]

the blue ignition has a slow flash and also the red reset, when the reset button is pressed everything starts up as normal but goes off at around 40-60 seconds later. Thanks

 

[holty]

check water pressure should be about 1-1.5 bar on the dial on the boiler.if that doesnt help i would suggest.you get an RGI out.if its what i think it is. its a straight forward job for an RGI.but first check your pressure at the boiler.