Dehumidifier shows F1 and may still run in a limited mode

Safety: Disconnect power before accessing the control panel.

• Reset settings: Restore the dehumidifier to factory settings (refer to user manual) and power cycle the unit.
• Clean intake area: If the unit has been used in a dusty or smoky environment, gently clean the air intake and area around the humidity sensor with a soft brush.
• Compare with external hygrometer: Place an independent hygrometer near the unit. If readings differ drastically, the internal sensor is likely faulty.
• Replace humidity sensor: Install a new Inventor humidity sensor module and reconnect it to the PCB.
• PCB issue: If a new sensor does not correct F1, the main PCB’s analog-to-digital converter may be defective and the board should be replaced.