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The Crown CE series of amplifiers have a 7 stage fan that runs as needed when the amplifier is working. Generally the fan is running at some point most all of the time, and you should be able to hear it ramp up as you push the amp to deliver more power. If the amplifier fan is not functioning, you may be in a thermal shut off mode that protect the amp from overheating by shutting off any signal. My advise would be to contact the manufacturer, and have it serviced.
Crown utilizes small signal transistors as thermal tracking devices but i think that this is not the main issue with the amplifier, it could be in the output stage with some power transistors failure, does the other channel works fine?
This is a very sophisticated amp and it will turn the fan on at various speeds when it feels the need for it. Of course, if it's running REALLY hot, going into thermal protection and/or posting a fault you might take a look at it to see if it CAN turn (no obstructions).
Have you swapped the speakers around to eliminate them as external causes?
When the channel dies is the unit very hot and is the fan turning very fast (it should be if hot)? The fan could be defective, slow or airflow may be restricted.
Turn the amp off and examine the fan guard on the rear to make sure it is clear of dust and debris. Vacuum it out if necessary. With a small thin non-metalic object reach in and test the fan for free movement by trying to rotate it. It should coast.
The amplifier is going into protection. This may be caused by problems with speakers or wiring, or there may be internal problems in the amplifier. Start by connecting a known good speaker with a few feet of wire, and see if it runs without shutting down. If so, check the wiring and speakers. If the problem continues, the amp should be serviced.
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