Sundance Optima problems

[liderbug]

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 have a nice sawtooth graph 102 101.9 101.8 --- 100.0 99.9 (5hrs) -> 102(15min). The panel display matches.

Now when it cools to < 100 another FLO2, circulation pump running and the temp drops at about 1/2 deg per hour. 95 as I write this. I discovered that if I disconnect the pump for a second and reconnect life is good - for one cycle. So? is a relay bad? the controller fubar?

Is it possible to get a schematic? Is there a WiFi replacement board? Oh and the local Spa shops have declared it too old to repair but we'll give you a nice trade-in on a new $12,000 tub. >WHFO<

Thanks for any help

 

[ajw22]

Welcome to TFP.

I have not seen any schematics here like you are looking for and you are deeper into the controls then most here.

Let’s see what @RDspaguy knows when he wanders by.

 

[RDspaguy]

Flo2 means the switch is reading closed when it should be open. Check the flow switch for function (open when it's off). New does not always mean good.
Check wiring and terminal for short.
Check back of circuit board for corrosion/debris/moisture.