Zodiac LM3 24 8 years old; Tennessee

The basics--

At start up had to clean up pool, balance water etc etc--Always done this myself. Finally, hooked up SWG--
No flow and low salt light on (had flow, water temp 65ish)

Used Trouble shooting guide and replaced Cell---Happy Dance!!! All lights on, could control out put, turn off and on etc. Came back an hour later--no happy dance, no lights, no nothing.

Back to LM3 trouble shooting guide--ordered both boards and replaced--nothing--Called original installer--Nothing
So, found out this model is discontinued and parts are getting hard to get. I would like to know what is wrong!!
Where is flow sensor? Where is circuit breaker in power pack to reset.

Should we just move on-------. There's so much more but...
Thanks