A climate controlled seating assembly comprising: a thermal module comprising: at least one inlet channel; at least one outlet channel; a thermoelectric device positioned upstream of the at least one outlet channel, said thermoelectric device being configured to selectively heat or cool a fluid passing through an interior of the thermal module; and a fluid transfer device configured to transfer a fluid from the at least one inlet channel to the at least one outlet channel of the thermal module, past the thermoelectric device; and a sensor positioned within an interior of the thermal module, said sensor configured to detect the presence of a liquid on or near said sensor; characterised in that the sensor is configured to detect the presence of a liquid by measuring an electrical resistance or capacitance across a portion of the sensor, the sensor comprising at least first and second conductive members (41, 43) and being configured to measure the electrical resistance or capacitance across said first and second conductive members, and wherein at least one of the first and second conductive members are etched onto a substrate of the thermoelectric device; a thermal module comprising: at least one inlet channel; at least one outlet channel; a thermoelectric device positioned upstream of the at least one outlet channel, said thermoelectric device being configured to selectively heat or cool a fluid passing through an interior of the thermal module; and a fluid transfer device configured to transfer a fluid from the at least one inlet channel to the at least one outlet channel of the thermal module, past the thermoelectric device; and a sensor positioned within an interior of the thermal module, said sensor configured to detect the presence of a liquid on or near said sensor; characterised in that the sensor is configured to detect the presence of a liquid by measuring an electrical resistance or capacitance across a portion of the sensor, the sensor comprising at least first and second conductive members (41, 43) and being configured to measure the electrical resistance or capacitance across said first and second conductive members, and wherein at least one of the first and second conductive members are etched onto a substrate of the thermoelectric device; at least one inlet channel; at least one outlet channel; a thermoelectric device positioned upstream of the at least one outlet channel, said thermoelectric device being configured to selectively heat or cool a fluid passing through an interior of the thermal module; and a fluid transfer device configured to transfer a fluid from the at least one inlet channel to the at least one outlet channel of the thermal module, past the thermoelectric device; and a sensor positioned within an interior of the thermal module, said sensor configured to detect the presence of a liquid on or near said sensor; characterised in that the sensor is configured to detect the presence of a liquid by measuring an electrical resistance or capacitance across a portion of the sensor, the sensor comprising at least first and second conductive members (41, 43) and being configured to measure the electrical resistance or capacitance across said first and second conductive members, and wherein at least one of the first and second conductive members are etched onto a substrate of the thermoelectric device;