I get a code c3451 - Konica Minolta bizhub 250 All-In-One Laser Printer

It is a generic warm up failure. You need the service call.

Code: C3451 · Description: Fusing Warm-Up Failure (Main) - The Fusing Roller Thermistor does not detect the required temperature

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Konica-Minolta bizhub 195 - Error Code - PrintCopy .info

https://printcopy.info > model=bizhub 195 > code=C3451
Code: C3451; Description: Warming-up failure - The thermistor/1 (TH1) detected that the temperature of the surface of the fusing roller did not reach the ...

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  Konica-Minolta bizhub 350 - C3451 - PrintCopy .info

  https://printcopy.info > model=bizhub 350 > code=C3451
  Konica-Minolta bizhub 350 · Code: C3451 · Description: Fusing Warm-Up Failure (Main) - The Fusing Roller Thermistor does not detect the required temperature ...

http://printcopy.info/?l=en&mod=erc&brand=Konica-Minolta&model=bizhub%20195&code=C3451

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.

Paper error...

Hi,
Hi,
Try this It could do the trick for you.

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 switched 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.

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Error Message C3451 and Printer Support and Konica Printer Support

gives the corresponding malfunction code and maintenance call

There is no c3451 code in the bizhub 350 service manual.

C3451: Fuser main heater problem.

due to the safety issue of a fuser problem osha has required the machine to lock up.
it could end in a fire if not.
you need to call a qualified service technician.

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.