Dehumidifier runs continuously and never reaches the set humidity

Safety: Unplug before accessing internal sensors.

Steps to diagnose continuous running:

• Verify actual humidity: Use a separate hygrometer to compare room humidity to the setpoint. If the room is actually at or below the setpoint, the unit should cycle off.
• Check humidity sensor placement: Ensure the sensor is not touching the cold coil or located in a dead-air spot. It should be in the incoming air stream.
• Inspect and test sensor: Check wiring and resistance of the humidity sensor. Replace if readings are out of range or do not change with humidity.
• Control board: If the sensor is good but the unit never cycles off, the main control board may not be processing sensor data correctly and may need replacement.

Test: After sensor or board replacement, run the unit and confirm that it shuts off when the room reaches the set humidity.