The unit displays E07 and stops; the fan may run, but the compressor does not.

Safety first: Turn off power at the breaker before working near electrical components.

• Locate ambient sensor: The ambient NTC sensor is usually clipped near the evaporator coil or on the unit frame in the airflow path.
• Check mounting: Ensure the sensor is not hanging loose or touching hot components. Reattach it to its original location.
• Inspect cable: Look for cracks or cuts in the insulation, especially where the cable exits the cabinet.
• Reconnect: Unplug and reconnect the sensor at the PCB to ensure a solid electrical connection.
• Replace if faulty: If the sensor reading on the display is unrealistic (e.g., -40°C or 99°C) or its resistance is out of specification, replace it with a Hewalex-approved ambient NTC sensor.