Humidifier displays F3 and shuts down; may occur after long operation.

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

Blocked air vents causing overheating, Failed base temperature sensor, Control board overheat circuit malfunction

Safety: Unplug the unit and allow it to cool for at least 20 minutes.

Steps:

Check ventilation: Ensure the humidifier is not placed against walls or curtains and that all vents are clear.
Clean air paths: Remove dust from intake and exhaust grilles.
Sensor inspection: Access the base and locate the small temperature sensor attached to the internal frame or near the transducer. Check wiring and connector.
Replace sensor: If F3 recurs quickly after restart and the unit is not hot, the base temperature sensor may be faulty and should be replaced.

Medium 3/5

Base Temperature Sensor

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