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Flo error

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Hi there,

I am the owner of Sundance optima 850. I do not know how olde since it came with our house. Flo and flo2 error appears on screen. I replaced flow switch changed filter and still keep getting these errors. The thing is that flow switch has only two wires coming out of it and when I disconnect one everything goes back to normal. Any ideas what’s causing this problem. Thank You. 

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