NEC PH3501QL Installationsanleitung Seite 128

If the temperature protector is activated
If the projector's internal temperature rises abnormally, the light module turns off and the temperature indicator flashes.
It may happen that the projector's temperature protector is simultaneously activated and the projector's power turns off.
If this happens, do the following:
- Unplug the power cable from the power outlet.
- If using in a place where the surrounding temperature is high, move the projector to a different, cool place.
- If there is dust in the ventilation holes, clean. (→ page 93, 94)
- Wait as such about 1 hour for the projector's internal temperature to lower.
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7. Appendix