How old is it? If you look closely at the wire connections inside the photocell do you see an corrosion (brown rust in this case instead of shiny silver). If the photocell sat in water it can wick in some water and short out, the photocell/LED is replaceable but it will generally need to be sent in to be replaced. IF the controller was bought 2009 or later it may have an internal plug and then you could change it yourself if you are comfortable opening the controller, older ones were soldered. It is a special photocell we don't generally sell outright since soldering and opening of the controller is usually required. Do not order 7094.050, this will not work and is only for 6091, 7091 and 7092 as well as the much older 7094.