That is a bad reading temperature of the Fuser Unit.
I will give same steps to unlock it.
Press yellow key
On the key pad press 1-0-7
Old the red key at least 3 sec
Press copy sp
Exit all the way out
Turn the machine Off / On.
This should be good. If doesn't work you have to call a technician to change some parts of the Fuser Unit like Hot Roller and thermistors.
Hope you understand.
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