Ruud Achiever 80 furnace/A/C won't start. Nothing works, including the blower. I found that the regular light-style external switch in the attic that supplies power had been brushed into a position halfway between On-Off while moving junk around. I turned the switch ON, checked the breakers, but the system is completely inoperative. The thermostat clicks, still can't turn fan or A/C or heat on.
Do I need to reset the unit somehow? I can't see how to open the side panels on the furnace box near where the wiring and 24VDC line enter.