Snb = Spa is shut down. Sensor plugged into jack B is not working
Find Jack B on your main computer board, and remove old sensor. Install new sensor and it should work. If you need to find the part, make sure you record the manufacturer of the hot tub, manufacturer of the control pack, and the model number off the control board. Having these three items documented when searching will help you greatly. I can help track down the part if you like.
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