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Temperature error, use simulation mode 14 for reset the error , if not replace the thermistor, & use stabilizer to avoid problems due to power fluctuations.
The error code H4 means that you have a problem with the fixing unit. It could one of the item's > The thirmistor or thermal fuse or the fixing heater lamp
for AR 5320 just check 1- main corona 2- leveling the developer unit 3- clean cleaning plate, for H4 just rest the machine as mentioned above, if not plz check fuzing unit -- thermostat
This means that the fusing unit has a problem. Turn off the copier. Open the small side cover on the right of the fuser unit. You will see the wire connectors leading from the unit and carefully remove them.Open the three screws holding the unit and remove it, check the heater lamp continuity if out replace the lamp. Clean the thermistor and return the unit by reversing the removing process. Now try the code and it will work.
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