Denco units high level pump warning

Hi guys . Had a unit go off on high level warning on a upflow denco unit pump failed . Got a new pump fitted it all good except one of the high level wires fell out before I could see where it came from

Any ideas one m8 said 40 but there isn't one ...


Jamie

Not even a trace of copper thread where it could have come from

A model number might be nice to share.