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  1. I have a Hayward H400FDN pool heater. I just replace the main board and it worked fine. However, after putting the heater in bO mode to use the pools control panel vs manually on the heater itself it just cycles through the indicator lights on the keypad and won't do anything. I've reset the circuit breakers, unplugged and reset all the board connections and I can't get it out of bO mode. The normal procedure of holding down the MODE and DOWN buttom for 3 seconds doesn't work. I've ordered a new Keypad, but I'm not sure that will fix it. It was operating fine until I put in bO mode
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