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Mend Halstead Ace High Combi Boiler Heating PCB

How can i fix my Halstead Ace High combi boiler?

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
HalsteadHalstead Ace HighHeating, Home Heating SystemsCombi Boiler Heating PCB
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

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Halstead Ace High Boiler: Flashing Green Light