Only two possible measures can be taken to rectify this problem, (1) cleaning the dew sensor or (2) disabling it, however neither procedure can be given as a reply on a web page as a JPEG is involved for illustration purposes and which "has" to go to a direct e-mail address, you having chosen to restrict yours. By the way the No2 method should only be attempted by a technical person acquaint at working on small precision pieces of electro-mechanical equipment.