AIRCARE digital humidifier displays LO and does not increase humidity output even when set higher.

Safety first: Unplug the unit before moving it if there is any risk of water spillage.

• Step 1 – Check room temperature: Use a separate thermometer to verify the actual room temperature. Many AIRCARE units require temperatures above about 40–45°F (4–7°C) to operate normally.
• Step 2 – Relocate the unit: Move the humidifier away from cold windows, exterior doors, or unheated areas that can cause the sensor to read artificially low.
• Step 3 – Allow to stabilize: Let the unit sit in the new location for 30–60 minutes, then power it ON and check if LO clears.
• Step 4 – Inspect temperature sensor (if LO persists in a warm room): If the room is clearly above 50°F (10°C) and LO remains, the thermistor may be faulty. Access the control area, locate the temperature sensor, and ensure it is properly connected and not damaged.
• Step 5 – Replace thermistor if needed: Install a new AIRCARE temperature sensor for your model and test again.

If LO persists with a known-good sensor and normal room temperature, the control board may be misreading the sensor and require replacement.