I have a Dometic lp-gas and electric Refrigerator. auto manual energy selector. this is the problem...When i turn the unit on it goes to gas selector..If it goes to the ac selector it will stay there for awhile then switches over to the check light. i have no LP gas at all and it should go to the ac and stay on. when i see the check light on i can turn the unit off. and then turn it back on later, then the ac light will come on but it goes off i would say within a hour and the check light comes back on...the unit does not cool at this point... can anyone help me with this problem