Pool and Spa
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When the display goes blank it usually means the tiny circuit board inside the topside control is bad, you can not replace just the board as it is a sealed unit so you have to replace the entire topside control. If you can access under the topside you will find a white sticker on the side of it with part numbers etc. Now to remove the topside you will need to peel off the display cover to expose the 4 small screws one in each corner then once screws are out you can pry up the topside and pull the wire out through the top of the spa make sure to unplug the topside from the control box circuit board.