What does this code mean? how do i clear this message
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Fuser unit sub-heating unit thermistat low temperature.
Firstly, check the thermistat hasn't popped. Just take the fuser out of the machine and push on the thermistats button. This will reset it if it has temp'ed out.
If it hasn't been done already through mod changes, move the washers from underneath the thermistat to above the thermistat and then screw it down. This gives the thermistat extra clearance over the sub-heater roller and can definitely prevent H4-02, H4-00 & H4-30 codes in the future.
If you cant reset the thermistat, and the code will not clear, it's time for a new fuser unit/service call (if you are not a tech), or check the sub-heater unit lamp, harness & clean the thermistats. Run sim 14, check fuser lamps working in sim 5. -
Trouble content The temperature does not reach the specified level
within the specified time after turning on the power
relay.
Section PCU
Case 1 Cause Thermistor trouble, heater lamp trouble, PCU PWB
trouble, thermostat trouble, AC power source trouble,
interlock switch trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp..
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If it is not lighted, check for the heater lamp
disconnection and the thermostat breakage.
Check the interlock switch. Check the AC PWB
and the PCU PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.Comment
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