This verified the indoor power supply was working. He then set the thermostat fan switch back to auto and went to the truck for his ladder to go on the roof where the air-cooled condenser was located.

Controlling Condenser Fan Speed Forcing less air across the condenser coil and reducing heat exchange by slowing the condenser fan has the effect of keeping the head pressure higher and more stable.

You may have dusted the vents and changed the filters, but neglecting to clean your outdoor condenser unit could be doubling your energy bills, and risking damage to your AC when you need it most. I'm ...