The cable box with the sensor cable is attached to the module cap (with a retaining thread which should not be removed until the cable box is to be installed). The sensor cable is already factory-fitted to the module.
Unless the sensor cable is connected to the cable box, the pump runs continuously. The LED indicator for sensor cable connection (6) glows red (when the sensor cable is connected, it goes out).
The LED indicators for pump control (5) and comfort setting (4) stage 3 glow green.