Electricity   issue
I installed a hot tub and did the wiring, I plugged into a GFI for a
week I had no issues, on Saturday night it blew the GFI  I replaced
the breaker  with a 20 amp instead of the 15, I replaced the GFI and
replaced the outlet, with just the jets going it will not blow, as
soom as I turn on the blower it kicks it, if I use an extension cord
and plug to another outlet its fine. Can someone suggest to me what I
might be doing wrong? Thank you.

That's hard, man.  Maybe something about the run from the box to the
outlet in the wiring?  Mice chewed a wire?  Good luck.

http://dmoz.org/Home/Home_Improvement/Electrical/

Hi tefoley24-ga,

   Increasing the rating on the GFCI outlet will not help, since it does
not alter the ground leakage.  The GFCI outlet monitors the current through
the nuetral/live terminals(they should be ideally same without leakage).
I suspect following is the case:
For some reasons, the blower ckt has developed a small amount of leakage.
Your ground ckt. at your default outlet is GOOD, so the GFCI kicks in,
detecting the leakage. When you use the extension cord, the ground at the
other outlet is faulty, so GFCI could not sense any leakage(unless it leaks
through someone's body!). Make sure you are using a three wire extension
cord(make sure the ground is electrically intact by checking continuity).
Try using the ground(only the ground wire) from your default outlet as the
ground for your extension(while still using the live nuetral from the other
outlet). Also some GFCI's are more susceptible to false tripping when used
with excessive lengths of wire(from the GFCI to equipment), you could try
relocating the GFCI near the equipment to rule out this problem.

Disclaimer: Do not attempt any electical repair/work just because you could
do it. Avoid the pain of damage/death by hiring a qualified professional.
I am not reponsible for any damage/serious injury/death caused by my
advise.  I am not a qualified electrician dealing with household electricity,
and so my advise should be considered with appropriate caution.

Regards
ldavinci-ga

sorry, I thought he meant is was kicking the breaker on the main
panel, not the gfci.  My fault.  idavince gives better advice.

tefoley24

Is the blower variable speed? I had the same problem with a kitchen
ventilator hood with a variable speed motor that had been wired on the
load side (downstream) of a GFI outlet.

If it was me, and I'm a licensed electrician, I would contact the
manufacturer of the hot tub. You may have a defective piece of
equipment and if not they should have instructions for hooking up the
unit. If the hot tub is not an assembly built by one manufacturer, but
an assembled unit you can still consult the maker of the blower motor,
however I would suggest consulting an qualified electrician.

Regarding the breaker: what size wire feeds the GFI? If it's 12ga+ a
20A breaker is OK, if it's 14ga, change the breaker back to 15A.

I second ldavinci's disclaimer - water and electricity are not a good
mix and beyond shock hazard it's important to recognize that the
National Electrical Code is produced by the National Fire Protection
Agency.

Waldo