head-overheatml5590

Fix OKI ML5590 error head overheat: Troubleshooting

The OKI ML5590 error head overheat triggers when the internal thermal monitor detects excessive heat. Many users ask why does my OKI ML5590 say head overheat? during long printing sessions. This typically happens when the print head works harder than normal due to dried-out ribbons or dust buildup. Following a cooling period and replacing consumables usually solves this.

1 views

Common causes

  • 1Prolonged printing without rest periods.
  • 2Use of sub-standard, low-lubricant ribbons.
  • 3Blocked air circulation due to dust.
  • 4Faulty thermal sensor (thermistor).

Solutions

Diagnóstico rápido

The error manifests as a stopped print job and a red warning LED. Touching the area near the carriage may reveal excessive heat, confirming that the thermal protection sensor has successfully halted the process.

Solución paso a paso

  1. Stop printing: Immediately pause the print job to allow the internal temperature sensor to normalize.
  2. Check airflow: Ensure the printer vents are free from debris or surrounding paperwork.
  3. Inspect ribbon: Replace the ink ribbon if it feels dry, as friction causes overheating.
  4. Wait cycle: Let the device rest for 15 minutes before restarting.

Prevención y mantenimiento

Avoid printing high-density graphics continuously. Proper ventilation and genuine ribbons are essential to reducing operating friction.

Cuándo llamar a un técnico

If the error persists after significant cooling, the thermal sensor itself may be failing and requires replacement.

Ficha técnica del equipo

  • Technology: 24-pin matrix
  • Ambient temperature: 5-35°C
  • Workload: High-volume compliant
  • Consumible: Original ribbon 40622601
  • Maintenance: Monthly cleaning
  • Drivers / firmware oficial

Steps to follow

  1. 1

    Stop printing

    Immediately pause the print job to allow the internal temperature sensor to normalize.

  2. 2

    Check airflow

    Ensure the printer vents are free from debris or surrounding paperwork.

  3. 3

    Inspect ribbon

    Replace the ink ribbon if it feels dry, as friction causes overheating.

Frequently asked questions

The print head thermal sensor has detected temperatures exceeding safe limits due to high-density printing.

The printer has safety mechanisms that pause operations before physical damage occurs to the pin components.

Low-quality ribbons lack proper lubrication, causing increased resistance on the print head needles.

Ensure proper ventilation and use original ribbons to keep operating temperatures low.

Fix OKI ML5590 error head overheat: Troubleshooting | Vimazdev