LK Room Thermostat RF ICS.2 WirelessLK Room Thermostat RF ICS. 2 Wireless Only compatible with LK ICS2 Wiring Centre Wireless room thermostat with background lit display for easy and clear function display. The display shows, the set and actual temperature, heating on off, operating mode and any error messages, etc. For the best energy efficiency, the room thermostat uses a so called self modulation technique consisting of signal pulses to the valve actuators. The self modulation