Originally Posted by carmon
do the same test R to Y
R and Y shouldnt show power between them,check from Y to C on the board in furnace.
If you have nothing between Y and C when stat is set to cooling check wiring between furace and stat or stat itself.
If all else fails remove the low voltage wires at the condensor and where they leave the furnace area,twist them together on 1 end and ohm the 2 wires on other end to check continuity.
The low voltage wires outside are often casualties of dogs,lawn mowers/weed wackers.