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The sparks really good (I took it out earthed it and watched to see the spark) and I have already cleared the S trap as I saw that on another post. There seems to be no gas smell at all so I'm thinking the gas valve diagnosis I was given is the most likely at the moment.

Thanks for the reply.....Yeah the flame detector was the first thing I tried and it seemed to work OK for a while but then started playing up again. I think you're right about the gas valve. I've got a really good spark but there is no gas going through now. The voltage to the gas valve goes...

If there is no resistance on the arm it means the valve is activated and should be open. Yes you can take the actuator off... i'm not sure of the part number you quoted but is it a silver metal box? If so you take the top off (one tiny screw on the end) and there are two brass coloured...

Hi I've got a problem with my icos boiler. It shows a F L messsage which means it has a flame error. Initially when I tried to start it it lt and ran for about a minute with a flame established then seemed to shut down and attempt to restart a couple of times. The restart failed and on...