3 line error code hot tub wont function how do i trouble shoot

limited info generic answer u code doesnt show for intex their codes usually start with E this is a manual that has the trouble shooting on page 20 ------- https://www.manua.ls/intex/purespa/manual?p=1 --------- and pg 13 has the codes

circulation pump failure

Hot Tub Error Codes - Spa Topside Error Messages

Hot Tub Essentials https://www.hottubessentials.ca > hot-tub-error-codes
1) Hot Tub Error Codes (Alphabetical) ; COOL, Spa water is more than 20° F cooler than the temperature set point ; CP-ER, Circ pump failure ; DR, dr, dy?

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Videos

https://www.google.com/search?q=hot+tub+wont+inflate+after+3+seconds+a+E02+code

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Answer
E96 means the PureSpa is experiencing a system error. If the control panel displays this error, turn off the system and unplug it. Plug the unit back in and restart it. If the error persists, turn it off and unplug it. After unplugging it, unscrew the B and C connection until water starts to leak out. Do not unscrew them to the point that they come off of the tub as you can lose all the water in the tub. Loosening them until the leak will release any air from the control base. Tighten the connections and restart the unit. If problem persists, please contact the Intex Service Center for assistance.

go to lg.com, enter your model number and manual will show error codes and fixed for some including OE

Steve- go to http://www.hottubworks.com/ and check out the heater trouble shooting guide. Pretty easy to narrow it down. Most common is filters being clogged (lack of flow) or heater element has burned out (easy to replace) there is a video how to do it.

Is the board getting power, is the control lighting up?
Do you see any error codes on the top side control?
Improper flow will give you an error code, caused by flow issues or a faulty flow switch. Make sure all gate valves are open and the water can flow freely.
If not then check your Hi Limit sensor. This is the overheat safety sensor if it fails the tub will not function at all.

FF 04 and FD 02 might not be error codes.

In the UK, 'FD' stands for either 'Filtration Duration' or 'Filtration Delay'. As I'm not in the office right now I don't have a manual at hand.

Why isn't the hot tub functioning correctly??

Common Spa Builders (Gecko) error messages are, OHH, FLO, FLC, Sn1 and Sn2. Also they have three flashing dots which can appear on the display.

Kind Regards,
Ian Kime, from: http://hottub.synthasite.com

FL could be a code for low flow. If you have no circulation this sounds like it. If your pump runs and you have no flow you could have a problem with your pump. Or if you have the tub drained then it could be an air lock, if you open the drain valve till you get water out that should fix that. Also check to be sure the isolation valves are open under the spa. I hope this helps.