I did have a major problem recently. Ready to leave on a trip and slides would not retract. Finally used the override on the Firefly panel & got them in. Found out I lost all 120v control of AC & water heaters even gas water heater. Talked to Thor tech and tried to reset firefly by disconnecting batteries but no help. Finally got Firefly & Thor reps on phone together & determined that Firefly control went bad. Thor overnighted one & I drove to LaMesa in Phoenix. They changed it & got me going in 5 1/2 hours with the Firefly changeout. Thor took care of everything even though the coach was officially purchased 14 months ago. I still like my Aria 3901.