Just over 4 years old in church. We have cleaned air filter, now replaced air filter, switched OFF whisper, max temp around projector 25deg C. Have you any further suggestions other than complete strip down and clean.
I have run in to this time and time again. This is why I like to keep things clean. take the bulb out and blow the unit out with air and make sure you wipe off what you can with Q-tips The blub allows air to flow thew the filament so what ever dust that might touch the fillament while its burning will burn at a higher temp. this will send and indication to the unit to send a message that says replace bulb soon and If there is not enough air flow it will say CHeck air flow take the fliter out and clean it with water dont replace it. IF you do just buy a carbon pad and cover the hole(not recomended foir those who are not handy) but keep things clean and it will save you $ in the long run. How many bulbs do you want to buy?
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Open the cover. At some ends there will be 'filters', to clean the air entering the projector. If these filters are blocked with dust or lint, air flow will be blocked.
Clean any dust from these filters. Close the cover and check whether your problem is solved.
Unclip the air filter covers and remove the filters, making sure not to let the dust stray into the machine. Clean the filters. Depending on the type of filter, either wash them in mild washing up detergent or replace them if they are the paper element type. That is all one can do without stripping the machine down and clean the vanes on the fans.
Check your owners manual. This means that the air filter needs to be cleaned or that the projector has become too cold. My guess is the first one. The owners manual has instructions for cleaning or replacing the air filter :)
There is a menu item which has both the lamp hour reset and check air flow, etc. You must go into the menu and reset the air flow item. MAKE SURE YOU CLEAN THE DUST FILTER!! Heat is the number one killer of projectors and Hitachi's run "hot". I clean my projector once a week--Hey, I'm not rich. lol! Also, excessive heat will cause the lcd panels to fail prematurely and cause lots of other components to do the same.--Rick
Check Air Flow means that the heat sensor is activated. This message means that the air around the projector is not circulating well... causing the heat. Check that the projector has at least 2 ft free air around it. Also, make sure that the filter is cleaned.
You need to clean the filters. When the filters collect alot of dust on them, they block the airflow to the internal parts of the projector and can cause the bulb to blow due to the temperature getting to hot.
With most projectors there is a foam air filter behind a grill that is the opening to the cooling channels. A fan ensures air flow to cool the lamp, etc. This filter prevents dust from gumming up the works (and depending on design) may prevent dust getting into the optics. As the filter gets dirty it gradually cuts off the air and at some point a protective circuit kicks in and turns off the lamp.
If the projector is on you will feel a stream of hot air coming out of the exit vent. Projectors vary in terms of amount of air flow, so its difficult to define what is normal for a specific model. However, you can simply hold a hand in front of the vent and see if there is air flow (It will be hot air so, careful). If there is a "good" stream of air things are fine, but if only a very light flow is felt the filter may be dirty.
If the filter has not been cleaned or replaced recently make sure the projector is turned off and cooled down then take off the inlet cover and remove the filter. Clean or replace per the instructions for the projector (and periodically as defined .. but taking into account the operating conditions). Once cleaned turn on the projector and feel the "normal" air current for future reference.
Heat is one of the major causes of projector failure, so make sure cooling vents (inlet and outlet) are not obstructed and filters are kept clean