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2001 Sundance Optima weird FLO Error

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PAhottub:
Where do I start.....
I came here hopefully to find some advice and what's going on with my hot tub. I have browsed the forum finding others with similar issues but not quite the same as what I am seeing. I have a 01 sundance optima hot tub. The first issue I had was I had a Sn1 code. I replaced the temp and hi limit sensor. Seemed to fix the issue. Then my 1 speed pump quit working. I thought it was the control panel so I replaced it and that wasn't the issue. I also thought the circuit board was the problem and I replaced it with another used board and still nothing on the single speed pump. I swapped power on the pumps to see if the pump was bad and when I did that I can turn the single speed pump on with the 2 speed pump control. So I figure the pumps fine since it turned on. Swapped the wires back to how it should be. Used the tub for 2 weeks without the single speed pump. The other day I realized the water was getting cloudy and finally the tub flashes FLO and then the temp. It doesn't appear that the filter is working or the temp now. So I left the tub power off for a day and when I turned it on today the air bubbles turn on and theres no way to get them to shut off. I pulled the filter thinking maybe it was clogged and I still have the FLO error. The little TEMP indicator on the control panel turns on only when the 2 speed pump is running. When its off the TEMP indicator for heating goes off.

I am so lost and ready to strip this thing and take it to a landfill. Figured I would reach out to you guys before I do that. Could the pressure switch be causing all these problems? I got a number of issues, single speed pump doesn't work, filter system seems to be not working, FLO error.

Jacuzzi Jim:
 Guessing a bad circ pump.  Little pump beside all the big pumps.  You spent money probably not needed to spend.  Before trashing the spa, you might call a tech that actually knows more then you do.   And I don't mean to say that in a bad way!   

PAhottub:
Thanks man, if the pressure switch doesnt fix it I will change the circulation pump. Would that have anything to do with my 1 speed pump not working?

Jacuzzi Jim:
 Yeah it doesn't have a pressure switch. it's a flow switch.  Not a lot of difference, but it is. 

PAhottub:
flow switch didn't do the trick. Going to try changing the circ pump. Living in rural PA doesn't leave much for reliable spa repairmen.

Isn't it weird that when I turn the breaker on and send power to the hot tub that the air bubbles come on?? They come on and I can't get them to go off, and it also still throws the flashing FLO error

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