H3
Devola
Ultrasonic Transducer Drive Fault
Devola humidifier displays H3 and no mist is produced even with water in the tank.
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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
Failed ultrasonic transducer disc, damaged transducer driver circuit on PCB, corroded transducer wiring, moisture-damaged control PCB
How to Fix / Troubleshooting
Safety: Unplug the humidifier before opening the base.
H3 indicates a problem with the ultrasonic mist generator.
- Visual inspection: Remove the tank and inspect the transducer disc for cracks, discoloration, or pitting. Replace if damaged.
- Check wiring: Access the base and follow the wires from the transducer to the control PCB. Ensure connectors are secure and wires are not corroded.
- Dry the electronics: If there are signs of water ingress on the PCB, allow it to dry thoroughly. Light corrosion can sometimes be cleaned with isopropyl alcohol and a soft brush.
- Replace transducer module: If the disc is intact but H3 persists, replace the entire ultrasonic transducer module or base assembly specified by Devola.
- PCB replacement: If a new transducer does not resolve H3, the driver circuit on the main PCB is likely faulty and the PCB should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Ultrasonic Transducer Assembly
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