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Thanx chaps, will check these out on next visit to girlfriends boiler, not that my girlfriends a boiler of any sort, but ........ why am I nexplaining this to you.

Hi All. I have just replaced the old pcb with new improved variety 5111603. It now goes through start up routine up to flashing orange/green, the fan starts, but no ignition occurs. After a minute or so the fan stops and the led goes to flashing red 3 times/sec, indicating an APS problem. I...