Control device of a household appliance comprising an optical touch-sensitive switch

摘要

The device has a receiver (12) for generating a reception signal according to infra-red radiation received from a transmitter (5) and an auxiliary transmitter (7). Peripheral walls (15) of a mask (13) are arranged between the receiver and the auxiliary transmitter to form a separation part that comprises a passage opening (16) for passing part of the radiation transmitted by the auxiliary transmitter to the receiver to determine a malfunction of an optical touch sensitive switch (4) based on a signal received by the receiver from the auxiliary transmitter.