Ambient temperature too high.

Check the ambient temperature at the air inlets of the projector. Make sure that the ambient temperature does not exceed 35°C (95°F).

Blocked filters.

Check filters. Clean filthy filters or replace with new ones. See "Dust filter maintenance".

Malfunction air extraction system.

Check customer air extraction system for adequate extraction. The air extraction system must be capable of removing minimum 10 m³/min or 350 CFM per installed DP2K and DP4K B series digital projector.

Malfunction lamp anode fan or lamp cathode fan.

Check the speed and voltage of the lamp anode and lamp cathode fan. Replace any malfunction fan.