Hot gfi keeps tripping

GFI tripping is caused by an excess of electrical current between the device and the ground connection. The heater and pump should be on separate GFI circuits. Check to see which device is causing the fault and have it repaired or replaced.

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...

If your GFCI is tripping, it could be due to a bad heater element, pump, blower or ozonator. To determine which component is causing the problem, unplug the components one at a time and turn the breaker on. If the breaker does not trip after unplugging the pump, ozonator or blow, you've found the problem and you can now replace that component. If you've unplugged all three components and the breaker still trips, it's likely the heater element. Hiring a technician or replacing the heater is the next best course of action.

. sounds like the heater might be shorted.. also check the motor amp's when motor is running

if your GFI trips soon after the spa goes through the purge cycle then you need a new heater.
Yes the heater can develop a dead short and it causes the GFI to trip when power is sent to the heater.
Rod @ US Parts Center .com

this should be simple ...
1.shut off the power
2.disconnect wires to heating element
3. turn power back on and see if it works if so replace heating element 45-95 dollars

if it still trips unplug all the cables from the pumps blower ozonators and see if it runs now,,,, if so plug each cable back (one at a time) until it trips again.if it trips that the problem pump etc.

99 percent of the the time its not the gfi its a device that is wet or shorted out ..Try everything else before replacing the gfi

If by "trips the breaker" you mean the GFI then you are leaking current to ground, GFI's trip when there is an imbalance between the current going to the motor on the HOT side and returning from the motor on the NEUTRAL side, if it is tripping the GFI it is likely the sign of a failing motor.

The GFI is sensing a fault, and tripping to protect you. If there is another GFI in the circuit somewhere then you could use that normal receptacle. I mean if there is a GFI in the main panel.

Please Vote !!

sometimes gfi outlets go bad and trip try testing with a heavy draw machine in it or just replace it and see if this fixes the problem