I'm installing an Ecobee 3 Lite thermostat. I needed to add the PEK at the HVAC control board. Here's the original wiring of the HVAC Control board.
As you can see, there are 2 wires at the Y spot. I installed one of the wires in the PEK, and left the other one as is.
Here's an image of the wiring after installing the PEK:
Everything seemed to work well on the thermostat, but the AC is not blowing cold air. I suspect that it has to do with the wiring of the Y wire. Should I splice both of the original Y wires together, and insert that into the PEK? Or is something else wrong here?