"Larry" wrote in message
...
"Wilbur Hubbard" wrote in news:49219ae7$0
:

Today it magically started working again. Why did it do so?



The contact arced, cleaned itself as it is designed to do, and contact was
restored as it burned away the corrosion.


Good theory but turning the knob manually to the off position turned the
unit off. So if it were dirty and needed to be arched a few times it would
not have turned off manually would it? BTW, I can see the contacts working,
they are in plain sight when looked at from the back side. They look clean
and coppery.

Wilbur Hubbard