Brother HL-L2300D Service Manual page 46

 Error code 0501
Print Unable 05
Turn the power off and then back on again.
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time.
Error code 0502
Print Unable 05
Turn the power off and then back on again.
The center thermistor of the fuser unit has not reached the specified temperature within the
specified time after it was heated normally to the certain level.
Error code 0503
Print Unable 05
Turn the power off and then back on again.
The center thermistor of the fuser unit detected a temperature higher than the specified
value.
Error code 0504
Print Unable 05
Turn the power off and then back on again.
After the heat unit was heated normally, the center thermistor of the fuser unit detected a
temperature lower than the specified value.
Error code 0505
Print Unable 05
Turn the power off and then back on again.
The center thermistor of the fuser unit detected a temperature rise greater than the specified
value within the specified time.
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