Ricoh M018 Service Manual page 183

Thermistor Error
The thermistor output is less than 0°C for 7 seconds.
Disconnected thermistor
Defective harness connection
541
1. Check the harness connection of the thermistor.
2. Replace the fusing unit.
Execute "Engine Maintenance Menu" to recover the machine after
completing the recovery procedure. Otherwise, the machine continues to
issue this SC code and cannot be operated.
Print Ready Temperature Error
The heating roller temperature increase during a set time is not correct.
The fusing temperature does not reach the print ready temperature within a
set time after the fusing lamp has turned on.
Defective thermistor
Incorrect power supply input at the main power socket
542
Defective fusing lamp
1. Check the voltage of the wall outlet.
2. Replace the fusing unit
3. Replace the fusing lamp.
Execute "Engine Maintenance Menu" to recover the machine after
completing the recovery procedure. Otherwise, the machine continues to
issue this SC code and cannot be operated.
SM Appendix 3-13
Service Call Conditions
M018/M019