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my potterton suprima central heating/water heating wall mounted boiler?

The red light is flashing. When I press reset the green light flashes & then goes back to red.
annetta harris, November 2007
I have same problem new pcb will solve part number 5111603 pcb (kit) pcb upgraded by potterton. see bbc watch dog website early this year

keith, November 2007
link Click here to see other fixes for Potterton.