Sundance Optima problems

liderbug

New member
May 19, 2025
1
Colorado
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
 
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.