How to clear error code c 3421 on konica bizhub c253

https://printcopy.info/?mod=erc&brand=Konica-Minolta&model=bizhub+C253&code=C2152

SIR/MAM
TROUBLE RESET
FIRST, If this code comes back. Have a technician look at it DO NOT CONTINUE TO RESET the code!!!! AS this is for the Hot Part called the FUSER. It can catch on fire! And that will ruin a perfectly good day!!!!
1. Turn OFF the main power switch.
2. Turn main power switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, turn it on again more than 10 seconds after and check if the machine starts correctly.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

See the link below: looks like a cooling fan error code and the fan needs repalcement. You got a GOOD REP oh yeah...
http://www.copytechnet.com/forums/konica-minolta/27391-bizhub-c253-error-c-5370-a.html

what is the question?

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Drum, Transfer Belt and Fusing Unit Firmware Reset - http://www.bizhubreset.com
Drum and Toner Chip Reset - http://www.chipreset.eu
Transfer Belt and Fusing Unit Reset Kit - http://www.resetkit.eu
Konica Minolta Error Codes & Solutions - http://www.kmcodes.com

http://www.oasq.com/how-to-clear-error-code-c-3421-on-konica-bi-thread-733519-1-1.html

From another site

Details Subject:
C-255A (C255A), C-255B (C255B), C-2559 (C2559) or C-255C (C255C) at power up.
Description:
C-255x code at power up.
Solution:
CAUSE: The K (black) IU (C-255C) has failed. The M (Magenta) IU (C-255A), Y (Yellow) IU (C-255B) or C (Cyan) IU (C-2559) is not fully seated or has failed.

SOLUTION: Replace the K (black) IU (Item #A0DE02F for the bizhub C203/C253 and Item #A0DE03F for the bizhub C353). Reseat the color IU and if the problem persists, replace it. Item # Color IU Model
A0DE0CF Magenta bizhub C203/C253
A0DE0DF Magenta bizhub C353
A0DE06F Yellow bizhub C203/C253
A0DE07F Yellow bizhub C353
A0DE0HF Cyan bizhub C203/C253
A0DE0JF Cyan bizhub C353
SPECIAL NOTE: Solution contribution by Tom Kelly, Workgroup/SSD

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None Specified Details Subject:
After toner installation, C255x code within a few hundred prints.

Description:
C2551, C2553, C2555 or C2557 codes.
Solution:
CAUSE: Toner is not supplied due to abnormal position of coupling.

Normal condition The coupling is blocked by bracket

check toner cartridge is there any one dosent have ink

C 2554 Abnormally high toner density detected Magenta TCR sensor.
Clean the TCR sensor window on the underside of the imaging unit if dirty,reinstall imaging unit or change imaging unit.

sorry, cannot find that error code in SM. Are u sure is it correct code?

While holding down the utility/counter button and turning on the machine go to screen that say trouble reset press it says OK that power off and turn on again if comes back need a fusing unit.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f