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Error c3451 is a warm up error meaning the machine has not yet reached the correct temperature within a specific time. To Reset switch machine off using the switch inside the front door, not the one on the control panel. While 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. Tap that, OK will be displayed then turn off the machine and then turn it 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