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error c3451 is abnormal heating temperature. al you have to do is reset the machine. open the back cover and on the main board look for a micro switch. press it will the machine is turn on. i hope this will help you.
Power off using left side rocker switch.
Power on while holding utility counter
Press trouble reset.
Cycle power (rocker)
If it comes back immediately you need to replace the fuser.
The code is for fusing warm up failure. Turn the machine on, wait for the error, then open the front door - you will see a cover on the right hand side which you need to unscrew and remove, behind that is a board (PWB-S1- Tech. Rep. Setting Switches Board) press the trouble button then reinstall the cover and shut the door. Your printer should now reboot - if the error comes back you will need to have the fuser either repaired or replaced.
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