H2
Devola
Overheat Protection / Ultrasonic Transducer Over-Temperature
Devola humidifier shows H2 and shuts down; base may feel warm.
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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
Running without sufficient water, scaled ultrasonic transducer, blocked air vents, failed overheat sensor or thermal fuse
How to Fix / Troubleshooting
Safety: Unplug the humidifier and allow it to cool before touching internal parts.
H2 indicates an over-temperature condition in the base or mist generation area.
- Check water level: Ensure the tank is full and water is reaching the base. Running dry can overheat the transducer.
- Descale transducer: Remove the tank and inspect the ultrasonic transducer disc in the base. If covered with white limescale, soak the area with a 1:1 white vinegar and water solution for 20–30 minutes, then gently wipe with a soft cloth. Do not scratch the disc.
- Clean vents: Make sure any cooling vents on the base are free of dust and lint.
- Restart: After cleaning and refilling, plug the unit back in and test. If H2 returns quickly, the overheat sensor or thermal fuse may be faulty and should be replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Ultrasonic Transducer Assembly
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