My heatpump started throwing a breaker when we tried to turn on the AC. I found an exposed wire in the wiring on the indoor unit. I resolved that and the fan would come on, but not the outdoor unit...condensor. I have also tried crossing the R and Y wires at the thermostat...nothing. The contactor outside on the condensor appears to be stuck "in", yet still nothing. I tried to push it in with a stick and could only get contact on one side. I had to use a lot of pressure to push it in any farther since it seemed to be stuck. A friend (works for heat and air company!) looked at it early on, messed with the wiring, and I believe he made things worse! I don't seem to be getting the 24 volt signal from the inside unit to the compressor. I have a wiring diagram, but not being an HVAC person, I'm not sure what everything is in the unit in reference to the diagram..i.e. sequencer, fan delay relay? Any ideas of where to go from here in my troubleshooting would be greatly appreciated. We reached almost 100 degrees today!!!