Originally Posted by harlan_husker
I replaced my old mercury thermostat last fall with a honeywell rth230b digital model and furnace worked fine all winter, now that I am trying to use my air conditioner its like the thermostat does not recognize cool. I have 4 wires two red and two white, one of the Red wires I have plugged into RH and a jumber between RH and RC, then a white in W and a white in why and the other red in G. I can turn the fan on but the cannot get the actual air conditioner to turn on. Do I need to move the red from G to RC and discard the jumper?
Since the wires came off a mercury stat I assume the new digital works off batteries, meaning there is no 24v common wire . You should be able to switch the wires to check their positions. You still need the jumper. If that doesn't work then you have something wrong with the outdoor unit. Let me know.