Display shows E14; unit refuses to start after being stored in a cold area.

Safety first: Keep the unit unplugged while it acclimates to room temperature.

• Warm up the appliance: Move the carpet cleaner to a heated indoor area (15–25°C / 59–77°F) and leave it unplugged for at least 2–3 hours to allow internal components to warm and dry.
• Check for condensation: After acclimation, remove the housing and inspect the control PCB and sensors for visible moisture. Allow additional drying time if needed.
• Inspect ambient sensor: Locate the ambient NTC sensor (often near air vents). Ensure it is not in direct contact with cold metal surfaces that could skew readings.
• Test sensor resistance: Measure resistance at room temperature and compare with expected values if available. Replace the sensor if it is open, shorted, or far out of range.