Abstract: A method and apparatus for transmitting a measurement variable that is detected by a measuring unit and transmitted via a data transmission channel to a main control unit of a domestic appliance that is isolated from the measuring unit is disclosed. The measurement control unit is coupled to the main control unit via a data transmission channel through which a measurement variable detectable by the measuring unit can be transmitted to the main control unit. The data transmission channel is a line having a protective impedance.

Abstract: A method and apparatus for transmitting a measurement variable that is detected by a measuring unit and transmitted via a data transmission channel to a main control unit of a domestic appliance that is isolated from the measuring unit is disclosed. The measurement control unit is coupled to the main control unit via a data transmission channel through which a measurement variable detectable by the measuring unit can be transmitted to the main control unit. The data transmission channel is a line having a protective impedance.

Abstract: The tumble drying device has a heat pump with a lifting magnet, with a rinsing valve of the heat pump being connectable by means of the lifting magnet, with the lifting magnet and a PTC resistor with a non-linear resistance curve being connected in series, with it being possible to heat up the PTC resistor by means of a current flow and said PTC resistor being highly resistive when a predetermined limit temperature is exceeded and with the limit temperature being adjusted such that it is reached before a permissible on-time of the lifting magnet is exceeded.