Disconnected wire of the temperature sensor.

Check if the wire (reference 6 image) of the temperature sensor is plugged into its socket on the Signal Backplane.

Damaged wire of the temperature sensor.

1. Repair the wire of the temperature sensor which measures the temperature inside the compartment of the Light Processor Unit. (reference 16 image).

2. If not repairable, replace the temperature sensor.

Defect temperature sensor.

Replace the temperature sensor (reference 16 image) which measures the ambient temperature inside the Light Processor compartment.