The problem on your machine is on the fusing unit, the temperature in the fusing unit is low to start the machine. To cancel the trouble status follow these steps:
Press CONTINOUSLY the following:
STEP1. Press CLEAR key then EXPOSURE key then CLEAR key then EXPOSURE key
STEP2. Then you are inside the simulation if the display turns OFF if not do again step 1 until the display turns off.
STEP3.press 14 then press print button
The machine will now cancel the trouble status and ready to used. If not cancelled and again H4 exist it means that there is a part inside the fusing unit that is busted like the thermostat. With this you should now contact your authorized serviceman to check your machine .
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