Laser printer have many sensor at defferent unit like paper input cartridge fuser paper output and some cover, you may try to check a sensor at back cover somewhere around the cover edge that look like a small switch, it can be actived by the cover, the error occur if the small switch not active, press the sensor then power on see what happened, no error you may adjust the sensor position that can be active by the cover. still error need to check the sensor or repair it.
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I have the same problem and my printer has been powered down and then on and I have reclosed the door 5 times
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