Ambient temperature too high.

Check the ambient temperature at the air inlets of the projector. Make sure the projector operates within specs.

Blocked filters at the air inlets of the projector.

Clean the front filter or replace with new one. See "Maintenance procedures".

Wiring issue.

Check / reseat the wiring between the Peltier Control Board and the small interconnection boards of the Light Source. Replace the wiring if necessary.

Insufficient cooling of light source

Check the tube connections between both the Light Source cooler and the light source. Make sure the tubes are properly connected.

Malfunction Peltier Control Board

Replace the Peltier Control Board. See "Replacing the Peltier Controller".

Malfunction Light Source

Replace the light source. See service procedure "Laser Phosphor Light Source".