SC541 is a Fusing thermistor open (center) The temperature of the hot roller remained below 0oC for 5 sec at the center of the hot roller. Fusing thermistor out of its position because of incorrect installation. Fusing thermistor disconnected or defective power supply not within rated range (15% or more below rating). Try cleaning or replacing the thermistors and reset code in service mode.
You have an over heat error. you need to test your thermistors, s and lamps for continuity.replace bad parts. then you need to go to service mode and reset the code
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