Yes it indicates a bad flow switch which can explode your pipes apart if left that way. Get a new switch immediatley and make sure it can't turn on without the pump first and shut off before the pump stops.
yes, i'm aware of the explosion risk if the cell runs without the pump...but the clocks are synchronized, so running while the pump isn't on isn't a concern even though it's technically possible. the way it's wired now is the way it was wired from the builder. the pump has constant power and runs on a schedule, and the cell timer (now sonoff switch) matches the pump's schedule.
the SWG is on a sonoff switch which continually syncs the time via NTP (was previously on an intermatic timer), and the pump has battery backup so the clock going out of sync isn't a concern. i was more concerned about it happening potentially when it was on the intermatic, because i was constantly having issues with the stupid little tripper things falling off. with the sonoff running the salt cell it shouldn't be an issue.
i was more asking if the temp issues i was seeing before could be related to the flow switch being bad, not worrying about the possibility of the cell exploding. i'm planning on moving to a nodejs pool controller over the coming months which will take care of the clock synchronization even further.