The F04 error on your Indesit Dryer means the control board has detected a fault with the drying temperature sensor (NTC probe) circuit. This usually points to a wiring or sensor problem rather than a serious mechanical failure, and many owners can check the basics before calling an engineer.

Error code F04
Meaning Fault in the NTC temperature sensor circuit used to regulate drying heat
Severity Medium — dryer may still run but drying performance and safety cut-offs are affected
Time to fix 20–45 minutes
Tools needed Multimeter, screwdriver set

What the F04 error means

The F04 code appears when the electronic control board can’t get a valid reading from the temperature sensor inside the dryer drum or heater housing. This sensor tells the machine how hot the air is so it can control heating cycles and prevent overheating. If the signal is missing, out of range, or inconsistent, the control board throws an F04 fault and may stop the cycle to protect the unit.

Common causes

  • Faulty or degraded NTC temperature sensor
  • Loose or corroded wiring connector at the sensor
  • Damaged wiring harness between sensor and control board
  • Sensor sitting in the wrong position after a repair or clean
  • Control board fault reading the sensor signal
  • Excessive lint buildup affecting airflow and sensor readings

How to fix the F04 error

  1. Power down and unplug: Disconnect the dryer from the mains before opening any panels for safety.
  2. Locate the NTC sensor: Find the temperature sensor, usually near the heater element or at the rear of the drum housing.
  3. Check the wiring connections: Inspect the connector for looseness, corrosion, or damage and reseat it firmly.
  4. Test the sensor with a multimeter: Check resistance against the manufacturer’s spec; replace the sensor if readings are way off or show no continuity.
  5. Clean lint and check airflow: Remove lint buildup around the sensor and heater area, as blocked airflow can trigger false readings.
  6. Reset and test run: Plug the dryer back in, run a short cycle, and watch for the error to clear. If it persists, the control board may need professional inspection.

FAQ

Can I keep using the dryer with an F04 error showing?
It’s best not to. The temperature sensor helps prevent overheating, so running the dryer with this fault risks damage or an incomplete drying cycle.

Is F04 the same fault as F04 on Indesit washing machines?
No, they’re different systems. If you’re troubleshooting a washer instead, see the Indesit Washing F04 Error Code: Causes and Fixes guide for washer-specific steps.

Do I need a professional to replace the NTC sensor?
Many owners replace it themselves with basic tools and the model’s service manual, but if you’re not confident working with wiring, call a qualified technician.