Worcester 28si flashing central heating light.

[JamH]

I have this worcester 28si, when central heating is put on the boiler will fire up and run for about 5 mins before cutting out and going to boiler lock out. I press the reset button and keep doing this. When i press the reset button and open a tap instead of running the central heating the boiler will fire for 5/10 seconds before going to lock out again but it keeps to run longer on central heating. it's a slow flash on the central heating light. How can i dertermin if it is the flame sensor, gas valse or the PCB.

Thank you.

 

[Dotty]

You determine it by calling in a qualified person!

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Thank you.