I have a catalina spa with BALBOA CONTROL PANEL

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.

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

First, we have to establish what you mean by turn on the unit. Is the GFCI breaker set on when you try to turn the "unit" on? What are you activating to turn the "unit" on? A switch, a disconnect, a button on the topside controller, etc.? Need clarification before we proceed to diagnose. At what level do you understand electricity? Is there a licensed electrician available?

Please answer and we will take it from there. OK?

When the control panel does not light up this means the panel is not working and needs to be replaced.

Rod
US Parts Center

check fuses inside cat system

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

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

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 !!

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