Coleman RV rooftop air conditioner displays F2 and may shut down or fail to start the compressor.

Safety: Disconnect RV power and ensure the rooftop unit is cool before working near the coil.

• Access the evaporator: Remove the interior shroud and any additional covers to expose the evaporator coil of the Coleman-Mach unit.
• Locate freeze sensor: The freeze sensor is usually clipped to the evaporator coil tubing near the center or lower portion of the coil.
• Verify attachment: Ensure the sensor is firmly clipped to the coil. If loose or hanging, reattach with the original clip or a new one from a Coleman sensor kit.
• Inspect wiring: Check the sensor wires for damage and ensure the connector is fully seated on the control board.
• Replace sensor: If F2 remains after reseating and inspecting, replace the freeze sensor with a Coleman-Mach approved part.
• System reset: Restore power and reset the thermostat. Run the unit and confirm F2 does not reappear.

Warning: Do not bend the coil excessively; this can cause refrigerant leaks.