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I believe you asked the same question before.... Make sure the waste toner cover / plug is removed and that you shook the cartridge to loosing the toner. You may have recieved a bad or defective toner cartridge...Good Luck
H4 indicates a heating problem in the fuser. The roller never reached a specific temp. Make sure the fuser is free of any left over paper pieces (maybe from a paper jam). Check to make sure its clean.
Try reseting the the error in service mode.
To enter the test command mode, press the keys as
follows one after the other :
[#] key [*] key [C] key [*] key then enter 14 and press start/copy key. this clear error counter. make sure to restart copier afterwards.