Dehumidifier shows H2 and stops, often in cold rooms

Safety: Unplug before accessing sensors.

Steps:

• 1. Check room temperature: Use a thermometer to confirm the room is above the minimum operating temperature (typically 5°C). If not, move the unit to a warmer room.
• 2. Inspect ambient sensor: Locate the ambient NTC sensor near the air intake. Ensure it is exposed to room air and not touching the evaporator or other cold surfaces.
• 3. Check wiring and connector: Inspect the sensor harness for damage and reseat the connector on the PCB.
• 4. Test sensor resistance: Measure resistance at room temperature and compare to expected NTC values. Replace the sensor if readings are out of range.
• 5. If H2 persists in a warm room with a new sensor: The main PCB may be faulty and require replacement.