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If your projector is out of warranty and not covered by a repair plan, I found several sources for the replacement fan with a Google search. IFixit has some videos for taking apart the projector to clean it and replace the fan on some BenQ projectors.
Look at the manual page 34, for the indicator messages. I suspect it's the same problem I have (which I haven't had formally diagnosed yet!), which I believe is a defective fan. My projector had been making a really loud noise on startup, which varied in length and volume. Recently the projector has taken to turning itself off after being on for about a minute, and the power light flashes green, with the temp and lamp lights flashing red.
You need to replace the balast as the voltages are buringing the bulb out and this is caused by a balast that is bad. The baslast is what the bulb connects to this has a sensor on it that relays voltages and heat back to the main control unit.
the lamp is running too warm from inability to cool down. clean out the dust with canned air and check the fans. the temp sensor may need to be replaced, as the heat may have desroyed it.
I don't have the manual on this one, but in general if the lights indicated that the lamp needed to be changed because of hours of use, then until the lamp hours have been reset, the lights will remain. The owner's manual should have the procedure for resetting the lamp hours. Try that and update this if you still have a problem. Also, check to be sure that the lamp access door is closed completely. There are safety switches that get activated when the door is not installed correctly.
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