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Ok, I found the problem on this boiler to be the fan not running. I have a multi meter but don't really know what to check for (my main work is installations) is there a way for me to check that it is the actual fan that is gone and not something electrically wrong using the multi meter? If so...

Just went to look at a boiler for a mate, never come across one of these sime combi's before. It had a flashing red light which I took to be the fault indicator, but I couldn't find anything in the manual about what it means. So I checked ho water was switching, thats ok. checked pump runs...

I have had a problem before where I had to change the diaphragm, it isn't that. This is for both heating/hot water, when I turn on the boiler the fan starts and I can hear the air pressure switch switch but no flames. I put my gas tester on the inlet and it is fine, but nothing on the outlet...