"Bryan" wrote in message
...
I can hear it from inside the house. This GFCI breaker box has been
out there for two years and now it's starting to hum. Should I be
concerned? How to fix?

If it's a rain tight breaker box with a double pole gfci breaker, you've
likely got a bad breaker. If it's a GFCI protected contactor type spa
disconnect, like the one in the following link, it's likely a buzzing
contactor, which could be from dirt, or corrosion, and probably needs to be
replaced :
http://www.spadepot.com/shop/Spa-Dis...-P696C287.aspx