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The Smile App can be used to operate Honeywell SDC heating controller. With this App you can easily change the operating mode of the heating controllers by using quick actions and in addition to that you can manage the time schedules. Alarm messages will be send to your installer or to yourself via email or push messages to your mobile device. Smile connect links the Smile App to the Smile controller which controls your boiler pumps mixing loops and room control devices for radiator and underfloor heating.