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Can't find the flow switch on J-355

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I have a Jacuzzi J-355 model hot tub.  It's about 5 years old.  I've been getting a Flow 2 error code - I replaced the filters and adjusted jets once to fix it.  Its back on again... I adjusted the jets again to try and augment the flow but it didn't work.  I bought a new switch to replace the old on but I can't find it on the hot tub.  The flow switch from the circuit board seems to go directly into a metal casing behind the control box that I assume is the heater.  Do I need to take this apart?

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Is it a flow switch or a pressure switch? Sounds like a pressure switch that screws into the heater tube. You will likely have to drain the spa to change it as there are no gate/slice valves in a Jacuzzi to block the water flow. 

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