Essick Air Humidistat Stuck On / Fails to Shut Off

Humidifier runs continuously and room becomes overly damp or condensation forms on windows.

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.

Possible Causes

Shorted humidity sensor, Sensor reading always low, Control board logic failure, Humidistat knob or buttons stuck

Safety first: Unplug the unit if excessive moisture is present to prevent mold growth.

Verify humidity: Use an external hygrometer. If humidity is above 50–60%, the unit should be cycling off.
Test controls: Lower the setpoint or switch to a lower mode. If the unit does not respond, the humidistat circuit is faulty.
Inspect sensor and wiring: Clean the sensor area and check for shorts or damaged wires.
Replace sensor or board: If the unit continues to run regardless of settings, replace the humidity sensor or main control board.

Hard 4/5

Humidity Sensor / Main Control Board

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