We decided to change the thermostat of our heat pump/air conditionnning unit. First 3 images are the old unit. The first 3 wires(1 and 2 picture) yellow red orange were not connected to anything, just hanging in the wall. the 4 image is the new thermostat. Now the problem I have is that my system doesn't cool only hot air comes out.If I put back the old thermostat everything works fine. reason why I believe the problem is my wiring?
1 and 2 are robertshaw 10-529 temperature sensor/ 3 is old york thermostat/ and 4 is the new thermostat honeywell rth 8500