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Flo error 2002 Sundance Optima solid not blinking


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Hi I have a 2002 Sundance Optima.  Was getting a blinking from error (flo temp) back and forth.  Finally figured out it was the circ pump.  Replaced the Circ pump worked fine for a day.  Now I am getting a solid FLO error.  Nothing works with the solid flo error.  If I reset the breaker it goes away but eventually comes back.  I also recently replaced the Flo switch and cleaned the filter.  Not sure what the solid flo error means?  Thanks for any help

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Update.  I realized when I'm getting the flow warning the circ pump is still running.  Came back from a bike ride today and everything was working normally.   I know that I will get the solid flo warning again.

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Put in new flo switch before the circ pump.  Can try putting back old switch.  Wondering if it could be flo switch connection it uses micro pins.   Does anyone know what the resistance should be for the flow switch?

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Tried the suggestions above.  I replaced the flo switch same result.   Took out the filter and let tub run still had flo error.

Any more suggestions would be welcome.  It runs for a little bit  when I turn off and restore power and then I get a sold flo error not flashing.  Circ pump is running but nothing else works.

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Sometimes that switch can be screwed in too far and contact the bottom of the pipe, caising it to stick closed or open.

The fact that it runs for a little while then catches an error suggests a board issue. Post pics of the circuit board and a close up of the e-prom (black rectangle with a white sticker about pinky sized).

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