Challenge Over-Humidity or Sensor Calibration Error

Humidifier displays H2; unit may shut off shortly after starting.

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

Humidity sensor reading out of range, sensor contaminated by mist or scale, control PCB misreading sensor

Steps:

Power reset: Unplug for 5 minutes, then restart.
Ventilation: Ensure the humidifier is not placed in a confined space where moisture accumulates around the sensor.
Clean humidity sensor: Access the sensor near the air outlet or intake. Gently clean with a dry brush. Do not spray cleaners directly.
Replace sensor if needed: If H2 persists, install a new Challenge humidity sensor module.

Medium 3/5

Humidity Sensor Module

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