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H4 normally is the problem with the fuse unit caused by thermistors or therm-state charge them then clean it by sim 14 but first check if the connector and fame then do sim 5-02 to check the lamp status
A H4-00 error code is a problem with the fixing unit. Odds are you will need to replace the fixing lamp or thermal fuse or the thermistor to solve your problem. You did not tell us what model of Sharp you have? There are many different ways to reset the code. Good Luck