Jwise502 Posted October 5, 2023 Report Share Posted October 5, 2023 I have a PDC spa hot tub and my display board has 3 blinking dots and a solid red light on the circuit board. I read that it means the high limit switch needs to be replaced but I don’t know where that is on my circuit board. Any help? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted October 5, 2023 Report Share Posted October 5, 2023 You don't have a high limit switch, you have a sensor, and it should be under the plate on the heater tube. Quote Link to comment Share on other sites More sharing options...
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