F4
Cecotec Overheat Protection or Temperature Sensor Fault

Humidifier displays F4 and shuts down unexpectedly

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Blocked air outlets, Failed internal temperature sensor, Fan not running (for warm-mist or hybrid models), Faulty main PCB

How to Fix / Troubleshooting

Safety: Unplug the Cecotec humidifier and allow it to cool before inspection.

Steps:

  • Check vents: Ensure that the mist outlet and any air vents are not blocked by objects, curtains, or dust.
  • Clean air path: For models with internal fans, remove covers and clean dust from the fan and vents.
  • Inspect fan operation: Power on briefly (with covers in place) and confirm the fan runs when the unit is on. If the fan does not run, the motor or driver may be faulty.
  • Sensor check: Locate the internal temperature sensor on the PCB or near the heater (for warm-mist). Inspect wiring and reseat connectors.
  • If F4 persists: The temperature sensor or main PCB may need replacement. This should be done by a qualified technician.
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Repair Difficulty

Hard 4/5

Required Part

Internal Temperature Sensor
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