Take care of it NOW. We ignored the error (knowing we're under a service plan so we'd get to it eventually). Then last week the TV just cut out and we got no picture and the red lamp light came on. Service guy came out today and replaced the lamp and it didn't work and then called Mitsubishi. They said it is probably a very common capacitor problem on the power supply board. If you open the back and take a look you are likely to see bulging caps. Parts C9A37 and C9A38. The caps are cheap if you can find them, but the parts are really hard to find right now so Best Buy is actually replacing these for people under service plans rather than fixing them. The message you are getting is a sign that the caps are getting too hot and need to shut down to cool off... It will eventually ruin your lamp if you let it go on.
Good luck! BTW, our guy said the repair will run you about $200 if you can't do it yourself, but someone else on this board with guru status recommends a kit that comes with a CD and a manual that will help you fix this. They even give a web address to order it. If we weren't under a service plan I would be going this route...
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If the set is only 3 1/2 months old, you should still have warranty coverage. Opening up the unit will void the warranty, so don't open up the set. Call for warranty service. In all probability, the air flow sensor is defective. The message you are seeing is a result of the air flow not being detected or not sufficient. In any case, this is a covered problem and should cost you nothing to fix.
If you have a WD-52525 Model TV and the the screen displays "air flow problem" change the sensor. There's not a positive way to check device, just replace it, trust me. IF your TV is a different Model MIT'S has a recall on those certain Models. REPLACE.
There is a Mitsubishi service bulletin for this problem.The source of the problem is the connector to the thermal fuse by the lamp.
The fix is to cut the connectors off and hard wire the fuse (you will have to splice in a 3"inch wire extension to make it reach once the 2-wire connector is cut off)
. Set shuts off after displaying the message "TV will shut down in a few seconds. Please check if the air flow is blocked." After shutdown, it may have a yellow status LED, self diagnostics indicates error code 38. To repair, replace the Lamp Thermal Sensor with the new version, part # 299P313010A. The sensor is located on the Lamp Cartridge Housing. See Service Tip VS-72B. Under rare circumstances, when a replacement thermal sensor is not available, refer to the original Service Tip, VS-72 (page 2 and 3 of VS-72B) If error 3-4 then this maybe problem:. Check to see if the lamp is on when the unit is off (in standby) if it is components on the Power PWB... K9A20 and/or K9A21 are shorted. Also, R9A02 may be open. Possible side effects ... deformed lamp exhaust duct and damaged lamp. Replace PWB-POWER part # 934C228003 and if necessary, Lamp part # 915P049010, Lamp Exhaust Duct part # 642B155010, and/or Lamp Exhaust Duct Cover part # 642B156010. See Service Tip VS-73 2. If the lamp never lights suspect the Lamp part # 915P049010