To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.
If inlet sensors are not installed, inlet sensors should be disabled on the System Setup screen.
Check to ensure inlet sensor is properly installed and all wires are properly connected.
Check if the error follows the inlet sensor. Disconnect inlet sensor cables from the module (connectors 8 and 9). Reverse A and B connections and check if the errors follows. If the error follows the sensor, replace the inlet sensor.