On my 2001 Bavaria 40 I have the Lofrans Cayman anchor winch controlled by a Quick brand up/down sender plugged into socket at the aft of the anchor chain locker.
I encountered an intermittent fault of lack of response in either up or down modes and initially thought the overload cutout had operated.
It turned out to be the socket plug; easily tested if you have this problem by slackening the mating screw and wiggling this plug whilst holding down the up or down button. Sure enough, there was my intermittent fault even though the wiring of both male and female parts of the socket and plug were firm. Despite the screw on gasketted cap, I fear corrosion gets to the innards interrupting a clean contact.
I was unable to get a 3 pin replacement socket and plug but found a 4 pin identical unit, wired appropriately did the trick with no further problems.