Returned to our clients home because the compressor was frozen over. Paul had shut the unit off earlier this morning to allow for it to thaw out. I arrived and immediately proceeded into the attic. I verified the wiring to be correct and began to further diagnose the system. I placed the unit into test mode and was not getting the proper signal outside. I diagnosed the wire to have a short and used a spare wire to send the correct signal for second stage. I also contacted TRANE tech support and ensured the blower speeds were set properly for first and second stage cooling. I ran the system in cooling and assumed the coil was completely thawed out. It was not. I had to place the unit to run in heat to melt off the residual ice on the indoor coil. Once the ice was completely melted I was able to properly test and check the refrigerant pressures on first and second stage cooling. Within 20 mins the thermostat had dropped 3º and was cooling with a 20º drop. I showed pictures and kept Paul
