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I purchased the 2nd generation NEST for my McQuay units in my condo. The McQuay units are controlled by wall thermostats. I have 4 stranded wires...Y (blue), G (green), Rc (red), W (white). I can send a photo of wires connected to original thermostat.
Basically, I am getting an E30 error = no power to Y1. After messing with configuration, I was told by CS that I have stranded wires, and stranded wires don't work with NEST. However, I have searched Google, and others have been able to get the NEST to work with their HVAC with stranded wires.
I would try taking out all the stranded wires and twisting them together into a tight bundle then reinsert them. Sometimes on stranded wires, the wires flatten out and NEST may not think there is a wire inserted into that connector. You may also have issues if the wires are too thin. In this case, you may have to use a wirenut and wire nut a larger wire to each of the smaller ones, then tape with electrical tape. Remember, whenever working with wiring, you should always turn the power to the unit off first.
I tried twisting the wires together, but this didn't resolve the issue.
The Y1 wire should have been making contact, as the previous thermostat worked. The error I am receiving is "No power to Y1 wire detected".
Okay, I will need to go to hardware store to purchase wire nuts and larger solid wire. What kind of wire should I purchase?
I will try this tonight, or tomorrow evening, and report back after that. Is it okay that I keep this case open until that time?
I wired an 18 gauge copper wire to the stranded wires for G and Y, and I am still getting the "no power to Y1" error.
Where do I find the board, and how do I check for continuity.
In the bundle, there is a black unused wire, and a brown unused wire.
I checked...the Y wire goes to the board. I switched the brown wire for the Y at both the thermostat side and the board side. However, I am still getting the same error message.