NEC NP-PE401H User's Manual - Page 66
Problem: Message Reminders, and then press and hold the HELP button on the remote control
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Appendices Problem: Message Reminders Over temperature - the projector has exceeded its recommended operating temperature and must be allowed to cool down before it may be used. Replacing the lamp - the lamp is about to reach its maximum life- time. Prepare to replace it soon. NOTE: When you continue to use the projector for another 100 hours after the lamp has reached the end of its life, the projector cannot turn on. If this happens, after replacing the lamp, connect the power cord and then press and hold the HELP button on the remote control at least 10 seconds. This will allow you to turn on the projector. Clear the lamp hours by selecting "OPTIONS" -> "LAMP/FILTER SETTINGS" -> "CLEAR LAMP HOURS" from the menu. Fan failed - the system fan is not working. Cleaning the filter 59 ... English