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What is model on the unit?
OK I have the manual for the unit on my desk.What are you referring to as OCT fault? Is that on thermostat or what?
I see the Outdoor Coil Temp sensor on the wiring diagram.Is this fault displayed on thermostat or control board in unit?
1.Will unit come on in Heat or Cool mode?
2.Can you verify the sensor is in tact and wires are connected on board?
Do you have a meter to check out the sensor?
If you have an ohm meter,lets unplug the coil sensor from board and check resistance on the sensor.
What is current temperature outside?
Somewhere in area of 7 to 8K