Wall-mounting thermostat for fan coils with 2 or 4 pipes. This thermostat can be coupled with one or more actuators Rx.Fancoil (up to 5 actuators). The keypad lock function prevents unauthorised people from doing setting modifications: this is useful for installations in public places. Digital input to connect a telephone activator for remote switching on/off or the switching of the operating mode (summer/winter). An additional input permits the connection of an external temperature probe or a window contact to switch off the system.