Been out to look at a betacom 30 in a multilet dive. Expansion vessel lost charge eons ago and custard has been resolving the problem with endless top ups. I have the mi's but they are sparse on fault finding tips or diagnosis trees other than a board connection diagram. The boiler will not fire and will not clear the no flame led lock out led. My suspicion is given that it does not attempt to commence a burner sequence that either the board is duff, low water pressure switch has gone or condensate trap probe or something else that would interupt the sequence before it even gets started. 230 at board but Fan doesnt get to turn. Pump doesnt run nothing and cant clear lock out led. Any pointers greatly received. Will probably call Glowworm Monday but I suspect I may get more usefull information here.