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Sir to fix will require you to take the rear panel off with the copier on. the upper rear panel once you have it off. Then find the circuit board on it will be a small black button, lower right side. press it. the machine will reset if it comes back your fusing unit (The HOT) part has a bad lamp thermistor, or thermosat. And will need replacing. The code will not clear by powering off then on. or by opening and closing front door.
These codes are generally related to the toner motor, if you have changed the toner lately.Check the install of the toner cartridge, remove it and reinstall it, close up the machine and try again.
Hope this is of som help.
Code COb31 means that the sorter didn't reset after a job. If you try doing a reset by opening the sorter as if there was a paper jam and it doesn't reset, it means that you have a problem with the sensors by the motor that turns the bins to open and clause as the paper passes. Give it a good blow with air. GOOD LUCK.