Nest E74 New Install

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A c wire connected to the nest thermostat fixes this particular issue. For now you can try things without the y1. Nest should then draw power from the w1 wire going to the furnace. I read about the y wire and the cold after posting and suspected that.

What is this famous rh wire, you ask? It's the primary power input for your hvac system, so needless to say, it's essential that it's fed a sufficient wattage. Next, we need to investigate what's causing the power cut. I have a carrier unit and it was a 3 amp fuse that was burnt. I replaced that and worked. Make sure everything is turned off again and keep the nest hooked up before turning on everything. I ended up burning another one but at least with the new fuse i got it had a light indicator telling me it was burnt out. Take out the float switch and move the float to the bottom. Wait for few seconds and check the rh wire status on the nest thermostat display.