If an error code like H4 reappears immediately after a reset, it usually indicates a hardware failure (like a blown thermistor or fuser lamp) that must be physically repaired before the reset will hold.
Turn the main power switch off, wait 5 seconds, and turn it back on. Resetting the Maintenance Indicator (Little Man Icon) how to reset sharp ar-6020
If you have lost access to the admin panel or need to wipe the IP address, print protocols, and user tracking data, you must perform a hard system initialization. Press the key on the operation panel. If an error code like H4 reappears immediately
The screen will display a reset confirmation or execution prompt. Press the button again. wait 5 seconds