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The C0500 error code is a fuser unit error code. The fusing unit is the part that gets hot and "fuses" the toner onto the paper just before it exits the machine. There is a special reset procedure for this code so as to prevent overheat of the fuser. You will need a service technician to diagnose the problem in the fuser and then reset the code. Most common causes are blown thermal fuse, bad thermister or rarely, a bad heater lamp.
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H2 or 2H is related to a fuser under heat or overheat.
Try this first,
Performing a Fault Reset 14 will reset your WorkCentre and will help to clear error codes.
Find the pink Clear button on the Control Panel of the WorkCentre.
Find the button below the word Auto.
Press these buttons in the following sequence: [Clear], [Auto], [Clear], [Auto]
NOTE: All of the lights on the Control Panel should go out and the LED Display should go blank. If the lights do not go out, then repeat step 3 until they do. It may be necessary to increase or decrease the pace of the [Clear], [Auto], [Clear], [Auto] sequence.
Press the [10's] key one time and the [1's] key four times to enter '14' in the LED Display, as if you were to make 14 copies.
Press the green [Start] button.
Press the pink [Clear] button two times.
The WorkCentre should now warm up and come to ready.
If the above steps do not clear the error code, repeat steps 3 to 6 a second time.
If this does not clear the problem the fuser will need replaced.
I think H" is the fuser not warming up. Suggestion trace back your replacements and make sure that all the cables are connected as sometimes when you refit the cover etc. you can knock or pull out a connection without knowingly doing it.