"AO" Error on Hayward H400IDL2 Heater

But come to think of it, the control board that I've swapped it out with was one that I had in my pool parts cabinet - and I think that may actually be the original board which was used with my old motor! There was nothing wrong with the board so I kept it. I haven't tried the heater with the board that came with the blower/board kit since swapping out the new vacuum switch, so I'll try that and see if there are any changes.
 
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