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I have a 12 year old Hayward H400IDL2 heater which I practically entirely rebuilt last year - new blower, control board, vacuum/pressure switches, and exchanger. I only needed to replace the blower (it had started rusting out), but I got a crazy deal on those other parts so I figured I might as...

New to the forum - well sorta, been lurking for a while but this is my first post. :D So here's my situation. Upon firing it up my Hayward H400IDL2 heater for the first time in almost a year, I got the dreaded AO code. I first followed the testing procedures in the manual for the control board...