On Tue, 10 Dec 2013 20:54:12 -0600, Irreverent Maximus wrote:

Some units will use a cord plugged into a receptacle. Usually
this is only for control voltage, but in his case the control
power supply also powers the blower. He might have a disconnect
that he has not noticed. Usually this is required, but if in
eyesight of the panel I don't think it is in this case.

As far as I can tell, there is no switch.
Just a power cord plugged into the wall.
http://farm6.staticflickr.com/5477/1...6604d692_o.gif