I have a Minimax Plus 250 heater with electronic ignition for my pool that won't fire up. The Heater light flickers for a fraction of a second, then nothing. I had this problem a couple of years ago and changing the ingnition circuit board fixed it. This time changing the board again has no effect. I appreciste it could be a range of other things but I have no docs to tell me how to approach sorting out the problem. Anyone know where I can get a service manual from, preferably machine readable? Alternatively any suggestions as to how I can pin it down would be welcome.