Hello Everyone - The fun began when I opened the pool a few days ago. The heater was completely unresponsive. I tested and confirmed that the unit is getting power so I assumed that the control board was fried... I replaced the board and membrane pad this morning and when I put power to the heater, the LED lights flash and 'R03' shows up on the display, then it shuts off... I cannot find any reference to R03 anywhere and have no idea what this means. Any input would be greatly appreciated. Thanks!