I have power to the boiler, the green power light is on, when i turn the heating, hot water or both on, the boiler boiler fires up then after a few few seconds it dies and the green power light flashes,green.
I have got experience in the building game but always get unstuck when it comes to boilers, when they go wrong.
I would really appreciate someones help with this.
If you can advise me what part may have gone, or could it be the PCB,thanks
David

David Kennedy, March 2011

air pressure switch maybe, but more than likely the thermistors faulty, telling the pcb its up to temperature when its not, bout a tenner each, change both.

IT WILL NOT BE PCB

craig, March 2011