Damaged wire insulation of the temperature sensor which measures the temperature at the Light Pipe entrance. When disconnecting the wire of the temperature sensor from its socket (reference 1 image) or from the Signal Backplane (reference 2 image) the error code is changed to “light pipe - temperature sensor open”.

1. Repair the insulation of the of the temperature sensor which measures the temperature of Light Pipe entrance (reference 3 image).

2. If not repairable, replace the temperature sensor and wiring.