Room controller with clock function (weekly timer) for wall mounting. Suitable for controlling central heating, hot water underfloor heating, night storage, warm air heating, etc. Extremely simple operation thanks to separate setting of the day and night temperatures. Additional rotary switch for 5 programs, day/automatic/night/frost protection/off. Selectable switching behavior, pulse width modulation or 2-point control method. Adjustable cycle duration of 10 or 25 minutes (sum of on and off times of the pulse width modulation). Clock power reserve in the event of a power failure is approx. 100 hours. Range restriction in the setting button to reduce heating costs. Device can optionally be operated with a remote sensor. 2 control lamps, heating on and reduction mode.