Hi All.
First thing, is to check the Power Sorce, Period. Where you have your RV plugged in to. It may not even be your RV'S GFIC Box at all, but somewhere in the circuit that your at plugged ito. A friend paid over $400 dollars to have a so called Seniro Service M obile Tech come out to his house. He fiddled around for a while, and changed the RV;s GFCI Box, then changed him $400 dolllars for the time it toook him to drive =both ways, and for sure marked up the GFCI Box plenty. He left, it still didn;t work.
I told my friend to unplug from that line and plug into some other line in the garage. "Hey" it worked perfectly. The first place he plugged into had a bad ground, so it keep poppong his GFCY Box.
Everyone should check their "Main Electrail Box" for lose wires and bad grounds on there entire RV every couple of years. Its called "Proventive Maintence Programs". Its really pretty easy to keep from breaking down, or having problems if you take the time to take good care of your RV, not just when you have problems.
Good Luck. Happy Travels. Dan & Jill & The Yorkie Kidss
1998-34 ft Rexhall, Rexair SL. 460 EFI. F-53. 7.3 MPG. TST TPMS. HWH Levelers. 5.5G Gen. Convection/Microwave Water Purifier/Water Softner. 2 A/C's. Alarm Systems. Honda EU2000i's W/Kit. Steer-Safe. CR-V W/SMI System. FMCA #F414397 Nam-Vet, 66-67-68&70-71