F5
Trotec
Overheat Protection / Base Temperature Fault
Humidifier shows F5; unit may shut down shortly after start.
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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, Running without sufficient water, Failed base NTC sensor, Faulty overheat circuit on PCB
How to Fix / Troubleshooting
Safety: Unplug the unit and allow it to cool before inspection.
Steps:
- Check water level: Ensure the tank is filled and correctly installed. Many Trotec humidifiers must not run dry.
- Clear vents: Make sure air inlets and outlets are not blocked by walls, curtains, or dust.
- Clean base: Remove scale and sludge from the base, which can affect heat distribution and sensor readings.
- Inspect base sensor: Locate the NTC sensor in the base and check wiring and mounting.
- Replace sensor: If the sensor is damaged or reading incorrectly, replace it with a compatible part.
- PCB replacement: Persistent F5 with a good sensor suggests a faulty control board.
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Repair Difficulty
Medium
3/5
Required Part
Base NTC Temperature Sensor
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