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The H4 code indicates the fuser may have blown the thermistor. It also could be a false error code. Try this series to clear the error and if it returns, then you'll know for sure the fuser is the culprit.
To reset press the following buttons:
Sharp - How to reset code To enter service mode press thesekeys: orange C button,Interrupt, 0, Interrupt. The screen goes black when you have done itcorrectly. It may take a few tries – must be done in certain time. To clear the maintenance indication (service man): press 20, start,1, start (the display will start to flash when entered correctly).Power off/on to make the copier dude go away. Good Luck!