E000, E001, E002, E003 CODES
To reset these codes perform the following:
Remove the front panel and be careful not to bend or break the flexible
cable connected to the panel and the DC Controller.
Turn on the copier and short the jumper wires JP3 and JP4 on the dc
controller pcb with a screwdriver.
The count ratio indicator on the control panel turns on 'F'. When 'F'
is turned on stop shorting the jumper wires
Turn off copier and turn it back on and its then reset.
E000 is related to the fixing unit temperature problem. Sometimes you have to replace the fixing film or even the whole fixing unit. Reset process for 14 different canon models have been given here: E000 Error, how to fix