HI
Essick Air
High Humidity Reading / Sensor Shorted
Display shows HI humidity and the humidifier will not turn on or shuts off quickly even though the room feels dry.
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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
Humidity sensor shorted or water-damaged, Sensor wiring shorted together, Sensor located in saturated airflow path, Control board sensor circuit failure
How to Fix / Troubleshooting
Safety first: Unplug the humidifier before inspection.
- Confirm room humidity: Use an external hygrometer. If humidity is actually high (above 60–70%), the HI reading may be accurate and the unit is behaving correctly.
- Inspect sensor location: Ensure the sensor is not directly in the moist air stream or near a vent where condensation forms.
- Check for moisture damage: Open the control housing and inspect the sensor and its connector for signs of water intrusion or corrosion. Allow to dry completely if damp.
- Inspect wiring: Look for bare wires touching or pinched harnesses that could short the sensor leads.
- Test after drying and repair: Reassemble and power on. If HI persists with normal room humidity, replace the humidity sensor or control board.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor / Humidistat Assembly
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