SOURCE: Error code C6020
Sounds like you have a faulty thermistor. (heat sensing device) The 6020 indicates an abnormally HIGH temperature. If the readings are greatly different in the two thermistiors or one is not touching the hot roller could also be the problem.
SOURCE: How to fix Error code C6020
Order the modified fuser plug connector. There is also a later firmware update to fix this code. This code happened to me on a few selected machines after I did firmware upgrades to add the interrupt button on the touch screen and to speed up the loading time. The thermistor is not guilty!
SOURCE: How to fix Error code C6020
I have The Km C2520 with the same C6020 code. Is the solution the same?
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