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OK - my bad - sort'a. It started out with the ground wire to the pump coming loose. I also have had experience with connectors making bad connections. So I un-plugged, re-plugged all the connectors several times. And it caused the the temp sensor in the heater tube to slip out and it was all...

Sundance Optima. New filter, new flow switch. Older hot tub that has been working good for years. However now we have a problem. Goes cold with a FLO2 and circulation pump runs 24x7. Aside: I've added a ESP-32 with a DS18B20. My Linux server runs Curl ever minute, Mysql, Phplot and I...