C3751 is a fuser errror:
The Fusing Roller Thermistor and Fusing Roller
Sub Thermistor are detected to be at a temperature
above 240 °C when the Main Power Switch
is set to ON.
To reset:
1. Press the Warm Restart switch, and "?" appears at the center on the left end of the
screen.
2. Enter "3" from the 10-Key Pad.
3. Type the 8-digit service code and touch [Enter]. (Default value: 00000000)
4. Press "Trouble Reset"
5. Turn the machine main power off/on
Note: Warm Restart switch is a small black button located behind a removable panel on the right side of the machine near the network port.
If the error code returns after the reset, a new fuser must be installed. Then the error reset procedure must be done again.
CAUSE: PU1 has failed.
SOLUTION: Replace PU1 (p/n 4040620101).
High temp on the fuser. To reset. On the right side of the machine just below the scanner section (The part with the big glass) is a cover next to where you connect the Ethernet cable. Remove the cover with machine on use a small screw driver and gentle depress the small black switch the machine is going to go thru some screens when you the screen with copiers on it to the left on the screen in the middle you will see a "." when that is displayed press 3. Code will come back but now press the Utility/counter button should see button that say maintenance mode press that see trouble reset press that machine again will go thru warm up procedure will see the "." DO Nothing! Should go to "Ready to Copy" if the code comes back have a technician look at it DO NOT CONTINUE TO RESET the code is for the Hot Part called the FUSER. Can catch on fire! That will ruin a perfectly good day!!!!
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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