F3
Rowenta
Temperature Sensor (NTC) Fault
Humidifier displays F3 and shuts down, often shortly after starting.
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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
Open or shorted NTC temperature sensor, damaged sensor wiring, connector not seated on PCB, overheated internal components
How to Fix / Troubleshooting
Safety: Unplug the unit and allow it to cool for at least 30 minutes before inspection.
- Check ventilation: Ensure the air inlets and outlets are not blocked by curtains, walls, or furniture. Overheating can trigger sensor faults.
- Clean vents: Use a vacuum or soft brush to clear dust from all grills and vents.
- Room temperature: Operate the unit only within the specified ambient temperature range (typically 5–40°C). Very cold or hot rooms can cause F3.
- Inspect sensor harness: If you can open the housing, locate the small NTC sensor (often clipped near the heater or air path) and verify its wires and connector are intact and firmly attached.
- Persistent F3: The NTC sensor or main PCB is likely defective. Replacement requires disassembly and correct wiring; consider professional repair.
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Repair Difficulty
Hard
4/5
Required Part
Temperature Sensor (NTC)
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