Dehumidifier displays P1 and does not start dehumidifying.

Note: P1 on many Challenge dehumidifiers is a status indication, not a fault, meaning the unit is in defrost mode.

Steps:

• Allow defrost cycle: Leave the unit plugged in and powered on. The fan may run while the compressor is off. After several minutes, P1 should clear automatically when the coil warms.
• Check room temperature: Ensure the room is above the minimum operating temperature (typically 5–10°C). Move the unit to a warmer area if necessary.
• Inspect for icing: If P1 persists, unplug the unit, remove the bucket, and check the evaporator for ice. Allow all ice to melt before restarting.
• Improve airflow: Clean the air filter and ensure vents are not blocked. Poor airflow can cause excessive icing and frequent P1 cycles.

When to seek service: If P1 never clears even in a warm room with good airflow, there may be a sensor or control issue that requires professional diagnosis.