
Welcome, as before mentioned by 007, sounds like a Battery dis-connect problem.
Since we have basically the same configuration, look above the entry door, there should be a small cabinet with the Battry switches inside, one for main battery, and one for house battery's. The rocker style switch's are a push on(upper) and push off(lower), the switch will always go back to the center position which is normal. Good luck.
David G.