Having a problem with a 5BGR56 fan with UC 5091 controller. The fan will only run at medium with a start assist by turning the blades. Low and High fan controls do not work. The upper light dimmer works OK. The lower light is permanently on at high with no dimming possible. Does the UC 5091 need to be replaced ( price please ) or is it the receiver in the fan? Thanks A Knight amandaknight@netzero.net