First ignore the revious solution, it is not even close. The error code c3451 refers to a copier warm up error, the machine had not reached the correct temp within a specific time. I bet it happened when you first swiched on one morning. Easy to reset and fault usually goes away.
To Reset switch machine off using the switch inside the front door, not the one on the control panel.
Whilst holding the UTILITY key down on the control panel switch the machine back on keeping the UTILITY key held down. Eventually a Trouble reset key will be displayed in the LCD screen, touch this, OK will be displayed then power the machine off and then back on.
This will reset the error code, if the code reoccurs then there will be a problem with the fuser unit in the machine, and this will require replacing.
hope this helps
Press power button for 10 seconds.
then open the front dorr remove ink cartridge then check there is not any paper jam.
also check in back side of printer then remove apper jam if any.
if problem still then reset all settings of printer to factory defaults.in printer menu
if still facing pro then check in back side 1 pannel pull it then refix RAM after clean it.
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