Fix Fujitsu DL3750+ E05 Error | Print Head Thermal
The E05 error code signals that the 24-pin print head on the Fujitsu DL3750+ has overheated. Continuous high-density graphics or letter-quality text printing without cooling breaks causes thermal lockout to protect internal drive coils.
Common causes
- 1Continuous long print jobs using high-density character print modes.
- 2Elevated room ambient temperature without adequate airflow.
- 3Blocked side cooling vents on the printer cabinet.
- 4Defective print head temperature thermistor sensor.
Solutions
Troubleshooting Overheat Error E05
This thermal protection feature prevents internal solenoid coil burnout during heavy workloads.
Recommended Actions:
- Cooling Period: Turn off the power switch and leave the top cover open for 15 to 20 minutes to allow heat dissipation.
- Check Airflow: Ensure side ventilation slots are clear of dust, paper stacks, or wall obstructions.
- Manage Duty Cycle: When executing massive print runs, mix high-quality text jobs with Draft mode to reduce solenoid thermal stress.
Steps to follow
- 1
Turn off power immediately
Switch off the main power switch to remove electrical current from the coils.
- 2
Allow print head to cool
Leave the printer cover open for 15-20 minutes to restore normal temperature.
- 3
Clear ventilation openings
Ensure at least 4 inches of clear space around the printer ventilation grills.
Videos
Frequently asked questions
No. The metallic casing of the print head can be extremely hot. Always let it cool before touching.
Yes. Once internal thermistor temperatures fall below safety limits, powering the unit on will resume operation.