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Sundance FL1 code

Hello, I have a Sundance Palermo 780 spa and recently have been receiving this FL1 code. I've done all the basic troubleshooting like, replacing filters, removing filters while running jets. I've also tried placing a hose in the filter screen intake to remove or flush air lock. I've had no luck in removing this code. I'm guessing now it is my flow switch or circulation pump, but would like some expert advice on what I'm seeing. I notice the flow switch is closed when circulation pump runs, I notice the flow switch is closed when pump 1 runs in both low and high speed. I've noticed the flow switch is OPEN while pump 2 is running by itself. Is this normal operation for the flow switch. The tubes appear to be clear and not restricted. Thanks for any help and advice.

-Dave

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