just adopted an older Jacuzzi from a friend, he said it would heat up to about 90 then trip the gfi, when he was disconnecting it, I noticed melted and black in the wiring box. don't know if it was his wiring into the box or something shorted in the "brain box". Need to know where to start, I know the outside of the box says 115v 20 amp, but if you look on the other side of the cover it gives a wiring diagram for conversion to 230v 50 amp, all the wires appear to be in the correct locations. Any help or thought would be great. I will send pics tomorrow or I can e-mail them(to big to post) wire that burnt is the blue #10
Thanks..

little more info, model tag says Asteria company , mod#9800000, name model 9800, mfg # 9404-04, serial #380268, it has top manual controls, I looks like Z-110/Z-120/310/320 as per http://clearcreekspas.com/model_id.html

of course we don't have it hooked up to power yet

Yup, those are melted! What I would do is get rid of that terminal strip all together and simply wirenut or replace the strip with a new one. Cut back the burned wire to get nice clean copper again. If the wire is too short to get good clean copper, replace. A loose connection caused that burn.

I had the same problem with my Jaccuzi hot tub, as a matter of fact it is the exact same connector that burned up in my tub. It is a 50amp terminal strip and it was not easy to find, had to wait almost a month as it was on backorder. Replace it and cut back or replace the bad wire. You can buy short lengths of #6 wire at Home Depot.

terminal strips are easy to come by, but I would just bypass it all together. http://www.newarkinone.com is a good source for term strips

Have you hooked up the tub yet? I also have a GFCI that trips sometimes. Some days it will heat to over 100, the next day the GFCI will trip a couple of seconds after the thermostat kicks in. Disconneced the heater and ozonater (sp), still trips sometimes.