Sharp Humidity Sensor Out-of-Range / Communication Fault

Humidifier or dehumidifier displays U2 and stops; may be related to abnormal humidity readings.

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 disconnected, sensor shorted by condensation, damaged sensor module, failed sensor interface on PCB

Safety: Unplug the unit before opening the housing.

Steps:

Dry out: If the unit was used in very damp conditions, allow it to dry for several hours unplugged to clear condensation from the sensor.
Inspect sensor: Access the humidity sensor near the intake/outlet. Check for water droplets or corrosion.
Clean and reseat: Gently clean with dry air and reseat the connector.
Replace sensor: If U2 persists, replace the humidity sensor module.

Medium 3/5

Humidity Sensor Module

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