I have an old Fedders Central air and heating unit , model # CUE010A2A. When I call for air or heat when the unit is turned on for the first time for the Winter or Summer it comes on and operate just fine, but when it's turned on the second time for heat or air the unit doesn't have power to it .When the breaker panel is checked, I discovered the unit circuit breaker was tripped. Do you know what might be causing this problem?