| C6 | The fan is not working. | The extractor is blocked/faulty or does not start, it does not generate depression and the control does not detect flow; check the start-up, voltage/power supply, and free rotation of the fan and the closure of the flue pressure switch. |
| C7 | Fan problem (fan not working). | No tachometric/speed signal from the fan or it is not rotating; check power supply to the fan, tachometer signal/wiring, and replace the extractor if there is no signal. |
| C1 | Airflow stopped during operation. | The extractor stops or does not maintain RPM, the depression drops, and the control cuts off; check that the fan rotates continuously and that the pressure switch closes during demand. |
| The reset button flashes once every 4 s (0.25 Hz), and the 90 °C indicator light also flashes (Euroline/ZW 23 AE). | Other types of fault: differential pressure switch / air ducts. | If the fan does not generate depression, the pressure switch does not close and this warning occurs; check the start and rotation of the extractor, the pressure switch hoses, and its switching. |