Https://printcopy.info/?l=en&mod=erc&brand=Canon&model=iR2420
Quoting from link above;
The sub thermistor detected an abnormally high temperature (295 deg C) during temperature control.
SOURCE: my canon ir 2420 is showing bios mode and what can i do to reset
Try downloading the firmware update tool from the cannon website otherwise. The unit likely has a bad SCNT board. There is no method for forcing an update while stuck in BIOS Mode. Canon part #: FM4-1273. MSRP is $335.87 if you buy new from an Canon Authorised Service Facillity (ASF).
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/joseph_f4ed739f62995525
SOURCE: Canon IR 2420 Copier Video Tutorial
Hope this might help you:
Canon imageRUNNER 2420L Full Review
as the error codes are cannon specific I suggest that you contact a canon service dealer and ask them what the codes mean
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