Need to see wiring diagram on control panel in apa

Easy way to test for the heater issue is to disconnect the heater from the board. Disconnect both leads from board and let the spa call for heat. There is also a chance the GFI breaker is bad however most times the heater fails and the breaker is doing its job.

Melisa, Breaker/GFI may be going bad. You may have to get an electrician to check for short or faulty motor/heater, etc. Check the attached links,instruction and guides, Good luck
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Troubleshooting tripping hot tub GFCI breaker
Hot tub GFI keeps tripping
Spa Circuit Breaker Mysteriously Tripping Any Clues Portable Hot Tubs amp...

make sure the spas control panel is set for 230v next check the GFIC it might be faulty. AS A TEST ONLY you can bypass the gfi af all works, try another GFI. but this doesn't rule out.. shorted motor,heater or even a light ..
give me a vote if'n I was of help.I love praise, it's the fuel that keeps me fix'n yer stuff.. Jay

nope, other than an open short in that circuit somewhere..

most portable units have a gfi like unit on the control box..it is shaped like an outlet but without the prong holes for a plug to go in.. my tub has one..its got a black reset buttom and a red test button on it..push in on the red button.. if the black button does not pop out(you will hear a click) its already tripped..push in the black button.. if the tub starts to work then observe the functions.. if not recheck the breakers/fuses at your main box..now as far as tripping the gfi..you may need to dry the wet motor out using a blow dryer(for hair) but there is an earth ground on the control box that you need to connect a simple ground wire to a rod driven into the dirt close to the tub..(if its outside)..the power cord to the tub needs to be as large as your electric stove connector is..thats a 50 amp 220 volt setup..anything smaller wont properly run the tub..do not use any smaller wire as it will get too hot and eventually burn up..it becomes a safety issue..be carefull with all of this..

Question is not fully clear.

2-pole 240Volt gfci circuit breaker requires the white wire be connected to neutral busbar.

Easy solution for 240Volt spa that comes with gfci:
Replace spa gfci with regular non-gfci breaker.
Install 2-pole GFCI breaker in main panel, and connect wire to spa breaker.
http://waterheatertimer.org/How-to-wire-GFCI.html#2-pole-gfci

Having 2 breakers is not a problem.
Having 2 GFCI on same circuit is a problem.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

#1. DO NOT GET INTO TUB FULL OF WATER WITH A GROUND FAULT.
2. There is a short. You need to get multimeter and start checking each part for current running to ground wire.
3) Power is ON. Connect power without GFCI.
4) Tape tester leads to wood sticks to keep hands away from power.
5) Do not touch anything directly or you will become the ground rod.
6) Ground wire must be present, and bonded back to main panel box.
7) Do not sit or touch directly on cement or bare ground. Do not touch or lean into anything made of metal.
8) Body and parts must be on sheet of plywood, or similar non-conductive dry surface.
9) Test each part with spa, but also test electric line coming from main box.
10) GFCI will also trip with any fault detected on line. So the wire coming to spa may have the fault.
11) Add a new dedicated line from main box to spa.

http://waterheatertimer.org/How-to-wire-GFCI.html
http://waterheatertimer.org/See-inside-main-breaker-box.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Your hot tub needs GFI protection because it is electrical, and people sit inside water that could be exposed to electric current.
You have a fault to ground that needs to be fixed.

Size 8 wire for 50Amp breaker.
Size 6 if tub is 50-100' feet away
http://waterheatertimer.org/Color-codewire.html

load neutral connects to the neutral binding screw on the GFI, do NOT connect the load neutral to the neutral bar.