Humidifier displays F1 and does not produce mist

Safety: Unplug the humidifier and empty the water tank before opening the housing.

Steps:

• Locate RH sensor: On Bionaire humidifiers, the humidity sensor is often mounted near the air outlet or on the control PCB behind the front panel.
• Dry and clean: If the sensor area is damp from overfilling or spills, dry thoroughly with a lint-free cloth and allow to air dry. Use compressed air to remove dust.
• Check harness: Ensure the sensor’s connector is firmly seated on the control board.
• Test operation: Reassemble, refill the tank, and power on. If F1 remains, the sensor or control board is likely defective.
• Replace sensor or board: Replace the humidity sensor module first. If the error persists, replace the main control PCB.