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Thanks to all who replied to this post. I did contact Potterton re the PCB and the Watchdog programme, but due to the boilers age they would not give me a new PCB, but did offer to send a engineer out, at my cost of course. A search on eBay found a brand new replacement PCB kit pt# 5111603 at a...

The pump runs so obviously 240V is there, but the pump is same age as rest of system i.e. 10 years old so could low flow be the problem? Pump is set to its highest speed. Stat sensors in boiler appear to be secure and connections checked and cleaned. Before I go for a new pcb can any of you...

Thanks for your reply, can you shed any light on the problem, matey

The New board has Two lights

This boiler is approx 10 years old, it has had a replacement pcb (the improved version with black reset switch) a few years ago. When cold the boiler will fire up normally and run for approx 1-2 mins then shuts down, it tries a relight and the burner ignites but the green light continues to...