Thermistor defective
Poor connection of the fusing unit
Power supply unit defective
Did you just replace the fuser? Unstable fusing temperature: The fusing temperature varies 50C or more twice in succession within 1 sec. Thermistor disconnected or defective. Fusing unit drawer installed
incorrectly.
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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