Hot Tub trips GFCI

[josephny]

I just installed a new hot tub with a Gecko IN.YJ-2 controller and it trips the GFCI breaker immediately.

I have quadruple checked the wiring, the terminals screwed down tightly, etc.

Troubleshooting I found that if I remove the black lead (one of the hot leads) at the tub the GFCI does not trip. Nothing else prevents the GFCI from tripping.

I believe the unit is set up for 240V by default. Terminals show LINE1, NEUTRAL, LINE2, GROUND (all are connected).

Anyone have any ideas?

Thank you!

 

[josephny]

Nevermind, I found my mistake:

The neutral wire coming from the hot tub needs to be connected to the neutral terminal on the GFCI breaker. I had it connected to the neutral bar.