Humidifier turns on but shuts off after a few seconds or minutes without reaching the set humidity.

Safety first: Unplug the unit before moving or opening it.

• Step 1 – Relocate the unit: Move the humidifier away from heat registers, bathrooms, or kitchens where humidity spikes quickly and can fool the sensor.
• Step 2 – Clean air path: Vacuum the intake and outlet grilles. Ensure nothing is blocking airflow around the unit.
• Step 3 – Bypass auto mode: Set the humidifier to continuous or manual mode (if available) and observe whether it still shuts off quickly. If it runs normally, the humidity sensor may be faulty or poorly located.
• Step 4 – Inspect humidity sensor: Access the control area and locate the RH sensor. Ensure it is not directly in the path of the outlet air and that its connector is secure.
• Step 5 – Replace sensor or motor protection (advanced): If the motor is hot to the touch and the unit shuts down, the thermal protector may be tripping due to a failing motor. Replace the fan motor assembly. If the shutdown is tied to false high humidity readings, replace the RH sensor.

After repair, verify that the unit runs steadily and cycles only when the room actually reaches the set humidity.