We have sargent EC400 Power Control System on the motorhome which is working perfectly except that recently we have heard a clicking coming from underneath the fuse box, it only happens part of the day, not all day. The reverse polarity light has started flickering, this light only came on when we were in France and never in this country. We are on a sites(CL) electric where we are plugged into a normal blue round socket. Everything works as normal otherwise, electric plug sockets, 12 volt sockets the heating and the ZIG unit above the door works normally. Any idea's why it has started clicking, it is not overly warm to the touch?