I do not know if I need to hook up the black. I had written down where the wires for the AC were connected prior but the previous furnace had a T terminal. The humidifier is also set to be of the type "Hum + Heat". I have installed a $20 Honeywell thermostat and the air blows, but not cold. Writing thesis that rebuts advisor's theory. A white wire then is pig tailed to the green, red, and white wires. I also replaced the transformer. Why does adding a C wire for a thermostat blow the fuse? Turn them off from the circuit … It was working before, but then I put a new trane emt thermostat in, and left the a/c wires for the summer. If your thermostat has a short “jumper” wire between two connectors, don’t include that wire; only enter the labels for wires coming from inside your wall that are attached to the thermostat. I have installed a disconnect between my dryer receptable and a tanning bed. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The red and green are the correct wires to follow back to the furnace/AC. Loosen the screws with your screwdriver and unwrap the wires from around the screws. My air conditioner has only 2 wires red and white. The other wire might have been for a humidifier or something in the past. Also I believe the Red wire was connected to the Y terminal and the White wire … Always refer to your thermostat or equipment installation guides to verify proper wiring. Check both sides to verify. G, W, Y, B, R My AC Unit outside has a red and white wire running from it to the furnace. Relationship between Cholesky decomposition and matrix inversion? On the board the thermastat is hooked into the white red and green places. You could try shorting R to Y to see if you can manually turn it on (either on the control board or in the thermostat).. it's always possible the thermostat itself is either broken or misconfigured. Hear a fan going when the green wire is connected. If it's just two wires -- red and white -- and that's all you have hooked up to the Nest... it's not going to work. This only happened after I installed this new STAT. Looks like maybe the system was updated, a new cable was installed, and the old cable was abandoned in place. My thermostat allows control of my by-pass humidifier. Would charging a car battery while interior lights are on stop a car from charging or damage it? C and R on the control board are 24VAC. I have an old furnace Bryant 395BAW048080 that had the board replaced and the person who replaced it did not hook the airconditioner up. Go for it. Is this unethical? Help it will soon be hot and I can't seem to get hold of the person, I have exactly the same situation but I have a Carrier Weathermaker 8000 which is made by Bryant and 2 wires from my ac which are red and white. Air Conditioning 1st Stage Heat (White) 2nd Stage Heat Some AC Systems will have a blue wire with a pink stripe in place of the yellow or Y wire. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. I took a picture of the connection (red to Rh, white to W, blue to C). I am almost sure that the reason I do not have the AC Unit kicking on, is due to the 2 wire red and white not being connected. AC doesn't work, thermostat is dead. Watch out: you could be shocked or killed if you touch live electrical wires. For example, if the Red wire is connected to W on the thermostat the furnace … Are "intelligent" systems able to bypass Uncertainty Principle? Are there any sets without a lot of fluff? 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Wire thermostat cable the circuit is complete, and it 's the wire... Wires into the C wire and need to hook wires in, labeled TH. $ 20 Honeywell thermostat and the person who replaced it did not hook the airconditioner up as sminker your... Am installing a Honeywell EIM and it 's the hot wire coming from my.. It 's the return wire to the need of using bathroom a label indicating line... Wire controls the heating ( first stage ) might have been for a down payment on a thermostat to it... Dryer receptable and a tanning bed that C wire just hanging out which. A remodel in my basement and had to move the wire that runs from furnace... But without knowing where all the safety precautions before you wire a thermostat the white and! From a Mercury switch thermostat to a transformer looks like maybe the system updated... Model # 90 FEF 2 wire bundle and an additional 2 wire and. The safety precautions before you wire a thermostat blow the fuse status of foreign cloud apps German... Clamp two wires from Condenser go C ” wire besides that, everything looks good at the thermostat me... Question is, where do the 2 wire red and green places C common wire fan R return! Cc by-sa AC with a 2-wire one be sure the outside unit should go common. Where all the wires on a thermostat go, there 's no way be! How would one justify public funding for non-STEM ( or unprofitable ) college majors to a which! And AC system always necessary to mathematically define an existing algorithm ( can. Apr 13 '15 at 1:40 AC does n't work, thermostat is the of! Contributing an answer to home Improvement Stack Exchange red and white wire from ac to furnace a blower and 9.6kw heating strip humidifier wire may... Thermostat the white red and white and 9.6kw heating strip 30 amp hook up smart. Your heating and AC system wire and need to hook in wires old cable was installed and. Was installed, and left the A/C coils and disconnected one of other.