H4-00 indicates that the fuser unit (right hand side where the hot rollers are) is not heating up. It could be a blown heater lamp or a blown thermal limiter. You can try resetting the code by pressing: #,*,C,*, 1,4, then choose yes or 1. this will reboot the machine. The h4-00 code may return but this is worth a try. Good luck.
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