I'm having a real bad time trying to get my thermostat to configure with my A/C unit.. the heating works.. the fan works.. but the A/C won't turn on. I've had the technician out and know it does work

I have a red, orange, white and blue wires

THe set up on my thermostat is as follows:

RC
RH
G
Y

What should go where??

Thanks in advance

What letters did the wires go to on the old thermostat?

Unfortunately, don't know. Is there magic to the colours of the wires?

Its not the normal colors hook up for a heat/cool system. You will need a jumper wire from RH to RC. I'm not sure how your heat is working with out a wire or connection for or on W. G-blower, RC- 24v hot cooling,RH- 24v hot heating, Y-compressor.