How to reset heating errors for konica minolta 420

https://www.google.com/search?q=Konica+Minolta+BH-420%2C+get+into+Service+Mode

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This is a under temp code from Temp sensor 1 (TEMS/1). You should check your thermistor, clean it. Then you have to reset the code.
To reset: Go to DipSW 3-1 and set to 0.
You may have a bad sensor or heat lamp.
Hope this helps.

FIXING HEAT UP ERROR

RESET BY OFF AND ON BY HOLDING UTILITY BUTTON OR RESET BUTTON

sir/mam
Do below once if the code comes back replace the fuser continue reset cause fire ruining a perfectly good day


1. Turn ON the main power switch (SW1).
2. With the Utility/Counter key pressed, turn ON the power switch (SW2).
3. Press [Trouble reset] to release a trouble with [OK] displayed.
4. Turn OFF and ON the power switch (SW2).

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

TCR output abnormality.Toner control ratio abnormality error code.Restart the machine if code removes then its OK otherwise simply replace the developer and execute TCR adjustment again.

I had an older Minolta a couple of years ago. I'll try adapting what worked for it to this machine. Hopefully this will work.

Press the "utility" button. Then hit "admin settings". Enter a password of 12345678. Then hit "user authentication" and put in "off". Hit panel reset from the main menu.

Again, I'm not entirely sure this will work for the 420 but its worth a shot. Good luck!

In Tech mode :
System 1
Initialization
Counter data fixing unit
Start button
Power cycle the copier

In Tech mode :
System 1
Initialization
Counter data fixing unit
Start button
Power cycle the copier

reconnect again your fusing unit. then before you ON your machine you long press utility/counter then press the small circle black, then press trouble reset.off/on

konica minolta bizhub 420
error code 2801 plesce relese the code prectical met