Connecting my Nest to both heat and AC

Hi,

I have previously figured a work-around to hook my nest up to the hydronic zone valve that controls my baseboard heaters, and now and now am trying to add in a relay to toggle power to my through-the-wall AC.

I connected the wires per the diagram that came with the Aube RC840T, but when I wired everything back to my Nest, I get an error that C is disconnected (it’s not)

The Nest is wired as follows:

• Rh/C/W1 - all go to heating and have worked fine for 2 years and I didn’t touch them during this

• Rc/Y1 are going to the RC840T-240, connecting to it’s R and W.

The relay is connected as follows:

• Red wire to power outlet
• Black wire to black wire from the breaker
• Blue wire to white wire from the breaker (which I think is the wrong color but I didn’t install this 240v outlet so I’m blaming the previous owner) - this connection also has a jumper to the other side of the power outlet.

Like I said, when all the thermostat wires are connected it says C is missing. If I disconnect Rh it says it’s not connected to power. If I disconnect Rc and Y1 it goes back to working fine, so I’m hoping I just have the 240V wires mixed up. Before I take everything apart again I wanted to see what Reddit thinks