X2 on first making sure you have AC power going to the GFCI. I had a GFCI that wouldn't reset. All ready to replace it when my brother-in law said (from his own similar experience) to check that power was coming out of the converter. Turned out that there are two small pop-out circuit breaker buttons (L1 and L2) on the side of the converter. One of them had popped open, cutting off the 120v power to half of the motor coach. I pushed the button back in to reset it and all was good again. Good Luck!