Dehumidifier shows P1 and stops dehumidifying

Note: On many Inventor dehumidifiers, P1 is an informational code indicating automatic defrost, not a fault.

• Check room temperature: Dehumidifiers are designed to work best above about 5–10°C. If the room is too cold, the unit will frequently enter defrost (P1). Consider raising the room temperature or moving the unit to a warmer area.
• Allow defrost cycle: When P1 appears, the compressor stops and the fan may continue to run to melt ice. Wait 10–20 minutes to see if the code clears automatically.
• Inspect for heavy icing: If the evaporator is heavily iced, unplug the unit and let it thaw completely. Clean the air filter and ensure airflow is not blocked.
• Sensor check: If P1 appears constantly even in a warm room, the defrost/evaporator sensor may be misreading. Inspect and, if necessary, replace the evaporator NTC sensor.