H2
Haier
Humidity Sensor Fault (Humidifier)
Humidifier displays H2 and will not produce mist; fan may still run.
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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 humidity sensor, Sensor wiring issue, Sensor contaminated by dust or moisture, Faulty main PCB humidity circuit
How to Fix / Troubleshooting
Safety first: Unplug the humidifier before opening any covers.
- Clean sensor area: Locate the humidity sensor (often near the air outlet) and gently clean around it with a dry cloth or compressed air.
- Check wiring: Ensure the sensor harness is firmly connected to the control board.
- Reset unit: Unplug for 10 minutes, then plug back in and test.
- Replace sensor: If H2 persists, replace the humidity sensor assembly. If the error remains after replacement, the main PCB may need to be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor Assembly
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