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Hi, there is no error 4 alone it is usually followed by a H that is H4. Try to key in the following C Auto C Auto then enter 14 and press Copy key. If it was power low voltage , it will not re-appear but if it comes back then replace heater lamp and reset again.
The H4 code indicates the fuser may have blown the thermistor. It also could be a false error code. Try this series to clear the error and if it returns, then you'll know for sure the fuser is the culprit.
To reset press the following buttons:
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.
To enter the serviceman test command mode, press the keys as follows: [#] key → [*] key → [C] key → [*] key To cancel the test command mode, press the [CA] key.
H4 00 Content Heat roller low temperature detection Detail The fusing temperature does not reach 185°C within 27 sec of turning on the power, or the fusing temperature keeps at 140°C. Cause Thermistor abnormality Heater lamp abnormality Thermostat abnormality Control PWB abnormality Check and remedy Use TC 5-02 to check the heater lamp blinking operation. When the lamp blinks normally. Check the thermistor and its harness. Check the thermistor input circuit on the control PWB. When the lamp does not light up. Check for disconnection of the heater lamp and the thermostat. Check the interlock switch. Check the power PWB and the lamp control circuit on the MCU PWB. Use TC 14 to clear the self diagnostic display.
-H4-21 means:Sub heater lamp abnormally low temperature detection. The setup temperature (about –25°C: Sim 43-1-1) is not reached within the specified time (about 32sec) from turning on the power ON SW. (When the temperature falls below 140°C in the standby mode.) -Causes: Sub heater thermistor defect Sub heater lamp failure Sub thermostat failure Control PWB failure
-Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power PWB and the MCU PWB lamp control circuit.
Clear the display of self-diagnostics with SIM 14.
The H4 errors will not reset by themselves. You must enter service mode to reset this error even if the problem has been repaired. The reset process is outlined below (DO NOT USE ANY OTHER FUNCTIONS IN SERVICE MODE):
Press the following sequence: "#/P" "*" "C" "*" Type in 1 4 Press start hit 1 for yes hit start
Unit should power off and the restart. If the error code recurrs ther are other problems.
The [H4-00] system error popped up when the power went out of the house. I called Sharp tech support (1-630-378-3590) and was talking to their tech support in less than a minute. The FIX? Just press the following keystrokes: # * C *This will clear the display error, now press…14, then press the green button twice.This should let your printer start to warm up and you have fixed your problem.
H4-00 is a fuser related service code. you need to get into the simulation programs and run sim 14 to reset the code. Make sure there is no paper jammed in the fuser. (The hot part on the right side inside the door)
The correct buttons to push in order to get into the service mode on a 162D are [#] key, [*] key, [C] key and [*] key. Then you key in 14 - 00 and press the Start key. If that fails to bring your machine back on, you'll have to replace the fusing assembly.