Sounds to me like you had a power interruption and when that happened, the control unit tried to sense gas but you had it turned off. The check light then came on. Turn the fridge off for about 30 seconds and turn it back on to see if it runs normally. I always leave my gas turned on, even though I'm not using it. I see no reason to leave the gas off except when I'm not camping. If you did have a power issue, the controller would have switched over to gas and returned to electric once it returned. I've camped over 80 days in the last year, traveled 5000 miles and am still on my first tank. That's while using the furnace many times to warm things up in the morning.
2013 Surveyor SVF 293
2013 Ford SD F250 4x4 SC; 6.2 EFI V8
Reese 18K Elite w/slider - Ada, Michigan