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The Optoma HD20P doesn't have an air filter.
If you remove the covers you will find 2 cooling fans that get a build up of dust on the leading edges of the fan blades.
These can easily be cleaned with a small paint brush and a drinking straw to blow out the excess dust.
If you are having overheating problems, please view my post on replacing the heat sink compound on the image processor.
if your projector often make overtemperature protection, you have to inspect the air filter,whether it is still clean, otherwise, you need to replace it.
it may just need a service, as all DLP projectors need to be cleaned internally as well as LCD. DLP projector images will flicker and lose colour also may shut down if it is very dusty inside.
Try cleaning the filter. If the area where it is installed is enclosed this will also cause over heating.. Make sure you have adequate air flow in the place where it is located and clean the filter.
The red indicator light usually comes on when something needs attention. Most often it has to do with the lamp timer or the filter timer. The projector keeps track of how long it's been since you've changed the bulb or cleaned the filter(s). You can reset these timers in the menu. Be sure to clean the filter before you reset the timer
The red indicator light usually comes on when something needs attention. Most often it has to do with the lamp timer or the filter timer. The projector keeps track of how long it's been since you've changed the bulb or cleaned the filter(s). You can reset these timers in the menu. Be sure to clean the filter before you reset the timer. :)
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