The bolier has green light flashing, but fan runs boiler comes own for about 10/15 section including the main burner but then stops have checked PCB its ok what can it be have checked all fuses, have drained and emptied the consedensation bottle.

Joe, March 2011

Just looked at the technical manual for this boiler, if the green light is flashing on and off constantly, there is one of two things going on:
Either there is a HW demand (check for dripping hot taps rectify as necessary).
Or there is a back syphon occuring when any cold tap in the house is used/turned off, the resulting back pressure can make the HW flow switch briefly (firing the boiler), try fitting a non-return valve to the cold supply to the boiler.

Carefree, March 2011