Yes we have a Mobile home heat air and it won't cut off it keeps running all the time and the air conditioning isn't working the coils keep freezing over. We cut the switch to off and it doesn't stop The only way we can get the motor to stop is by switching the breaker. We really need help figuring out what is wrong we don't know if it's the thermostat or the system itself is there anyway you can help us? Our system is a nordyne 917267A

Make a note or picture of where each thermostat wire is connected on the furnace,(colors), turn off breaker to furnace. Remove tstat wires from furnace. Turn furnace breaker back on. If it comes back on you will no its in the furnace. If not you will no the prob. Is in the tstat or shorted wires between tstat and the furnace