Fatal error 231 on oki c5800 after changing toner, tried power off/on still doesn't work

03: communication error between
the RFID reader and the toner
cartridge.

02: Replace RFID R/W
board.
03: Check the antenna
cable connection

First, there is no model C5900. There is a model C5800. On the assumption that you are having this issue with a C5800 then the problem is media wrapped around the fuser. After cooling you can try to unravel or unwind the wrapped media but you may need to replace the fuser.

I tried putting 1.5mm of plastic foam under the RFID chip to raise it up in the toner cartridge. This seemed to work.

231 fatal error is telling you that the data from the chip on the toner cartridge is invalid or cannot be read.

This may happen for one of the following reasons:

1)The printer is unable to read the data on toner chip because of toner dust or dirt inside the printer.
Solution: Clean the printer inside, clean toner slot and drum.. See:Clean your laser printer.

2)Either the toner is not an original cartridge, it is refurbished or refilled, or the chip on the toner cartridge is defective.
Solution: replace the toner, or replace the Chip on toner cartridge.

3)The toner sensor in your OKI is defective.
Solution: Call the support number listed on the printer manual to arrange repair.

communication error between
the RFID reader and the Tag
chip... THATS THE CHIP IN THE TONER CARTRIDGE

OKI C 5800Service Call 106:Fatal Error.

Fuser error. Replace fuser or if no-go, Main board.

This is a Toner Sensor Error, Color:Cyan

and can be corrected by checking that the Cyan toner lock lever is correctly in position.

Found this at Fixyourownprinter.com

1. Turn machine on while pushing and holding the TWO up/down menu buttons at same time.
2. Menu window will show "OKI USER"
3. Scroll to " Engine Dialog Mode" is indicated. Push Enter button.
4. "Diagnostic Mode xx.xx.xx S-Mode is indicated.
5. Scroll to "NV-Ram initial" is indicated. Push ENTER.
6. Window shows "NV-Ram- Initial Table 1".
7. Push ONLINE and ENTER Buttons simultaneously and HOLD for 10 seconds after you see "Executing Reset" appear in menu window.
8. Restart printer.

All toner, drum, fuser and transfer figures return to 100%.

Worked for me when I had the same error. Hope it helps.

This error code means that the fuser temperature is low. You need to replace either the fuser or the thermistor inside the fuser.