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H3-00 Heat roller high temperature detection
The fusing temperature exceeds 240C°.
Thermistor abnormality.
The easiest and cheapest solution is to replace the fuser.
This is very typical of a laser machine as some point the fuser will go out.
These little machines have a disposal fuser unit. It is possible to replace the parts. After the time and parts, in the long run it is cheaper to replace the whole unit.
That is a CRUM communication error. The CRUM is a chip that resides on the toner cartridge that keeps track of the toner usage and resets when a new toner is installed. If you replaced the toner recently it may be corrupt. If you got a refurbidhed toner they may have reprogrammed the CRUM incorrectly. Power supply problems often cause this error so check your outlet to make sure it is withinn the proper voltage range and also that it is not on the same circuit as other devices. Get a "real" surge protector designed for office equipment such as a smartpower. Try changing toners and using genuine supplies.
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