We’re here to help. NEST says C wire has no power (was working fine for months). Sometimes condensate overflow or low on refrigerant. Check at the furnace. And when this problem occurs it keeps short cycling my AC. Hi everyone. This may happen if you’ve forgotten to turn the power back on to the HVAC system or if you turned the power back on, but there was a fuze or breaker blown during the installation process. When I just do red and white for heat all good. If I unplug the furnace then reconnect the Y1 wire, it works for about an hour then gives me the warning again. Looked like it was cut so I coupled the wire together. Discover connected home devices from Nest – thermostats, indoor and outdoor security cameras, smoke and carbon monoxide alarm, security system, video doorbell and more. – Allan Apr 26 '18 at 0:45 Datsun parts for 240Z, 260Z, 280Z, 280ZX, 510, 520, 521, 620, & Fairlady Roadster I checked the thermostat wire where the worker may have accidentally cut it. Heat pump requires a Y1 wire: The Nest Thermostat is physically detecting a wire in the O/B connector. On my new thermostat, there are two separate Y connection points - one called Y1 and the other Y2. Remember, NEST does not recommend using stranded wire, but sometimes this problem can be overcome by the suggestions I made previously. I had a question regarding the wiring. Learn more at nest.com/e74. I am in the middle of installing a Nest thermostat. Should I wire my yellow wire to Y1 or Y2? current wiring is Rh, W1, C, G, Y1. First: Most likely the blue wire you found is not connected to anything at the other end. No power to W1 wire detected. Use a Common Wire With a Nest Thermostat. Sometimes it works, sometimes not. Helping customers save Datsun cars & trucks for future generations to enjoy! engineers must measure material characteristics in the E-band frequency range. Also, check continuity from the Y1 wire from the stat back to the air handler or furnace. That would be the first thing. Remove red wire from RED. So I checked and even cut fresh wire just in case there wasn't good contact since the switching of thermostats. If your Nest is reading low power or won't charge it may mean that you need to add a common wire transformer. No a/c, just a goodman gas furnace blowing into house thru vents. Learn more > Nest.com has moved to the Google Store. Please do let me know if you have further questions. Thermostat is fairly new. Hello! Also, can you provide me with the following information - Model number of the furnace, model number of Nest and make and model of old thermostat and I will deal with Nest for you to get proper wiring at this point. Note that “pulsing” is a term the Nest community has come up with for the problem, and Nest themselves do not seem to name this problem in any specific way. Talk to a Google Nest expert. Technology Editor Bill Wong takes some unwanted time to replace his Nest with an extra wire in it, but the system had been working for a number of years. Second: No power to Y1 is an indication of a problem with the AC. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. Nest Thermostat No common wire - Nest thermostat needs no common wire -problem solved, How To Connect the nest thermostat without a Common wire. Just because it worked before doesn't mean something couldn't have changed. Common problems with the Nest thermostat, what causes them, and how to fix it. The NEST showed the problem to be the Y1 connection but actually it was the Red power wire that was not making a good connection. Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no … Heater blowing but cold air no heat. Then about an hour later, I got the warning again. If so the O and B wires are unneeded and can be removed from the control panel. When I connect the blue wire in the thermostat I get a power issue on the nest e. I was told by nest tech support to disconnect it because it's not grounded. On my old thermostat, the yellow wire was connected to the outlet "Y/Y2". Put The Nest Thermostat back on the wall mounted plate and see what happens. Then twist together the Rh, G, and Y1. Does it make sense that the previous homeowner had a y1 wire running to the thermostat at all? Your Nest Thermostat isn't electrically detecting your W1wire, but one is connected to the Nest Thermostat base. She has a gas furnace and an A/C unit (no heat pump … read more i recently installed a Nest thermostat and it worked fine for 3 days at which point it lost power to the Rh I called nest and they had me disconnect the Y1 wire and i regained power to Rh and they told me i needed a common C which i had installed now i am no longer getting power to the Y1. There is no common wire with my system, although there is an extra unpowered white wire that was unused previously. N5, N25 & N75 No power to W2/AUX wire detected. Currently I cannot get the nest to boot due to a Y1 no power message, If I disconnect Y1 the nest will fully operate the furnace but obviously not the AC. Still same e80 with y1. I'm having problems with my Nest thermostat where it keeps saying my Y1 wire needs checked and that it can't operate my equipment that additional wiring is needed. My understanding is that the y1 wire is for cooling, and my house has no air conditioning (we don't need it in this climate). By turning your breaker on/off actually reset the HVAC power therfore providing power to the Y1 cable. This is 100% repeatable. A common wire transformer is used to provide power to the Nest if your HVAC system doesn't put out enough power and will charge the Nest Thermostat. Model GMS80704BXCC. If I disconnect C, it says no power to Y1. We had to take off the yellow and blue to make it work, but only heat is working. Hi all, Just got a Nest 3rd Gen as my heater (Stadt 525e-ea) which is a 24VAC system and the existing wiring had the required Rh, G, W, Y so passed the Nest com From RC move it to RH. This video shows how I fixed an error with my Nest thermostat. Electrician checked wires and they … read more my daughter has a Honeywell T2060F thermostat and wants to install a NEST thermostat. The next day, I tried reconnecting the wires while the power was off and then plugged it back in. See what happens. The error is E74 - No power to Rh wire detected. To check disconnect wires from the Nest base. As soon as I attached yellow blue and green I get the issue. When doing your own research on the Nest pulsing problem, look for terms like: pulsing, cycling, short cycle, power leeching, no c-wire, heat-only and cooling-only. Not so sure it was actually cut but I did it anyway. Power was restored to Y1, so I thought I fixed it. Your Nest Thermostat isn't electrically detecting your Y1wire, but one is connected to the Nest Thermostat base. Diagnose bad sensors as possible cause. The Honeywell has a "K" terminal wire where the NEST does not. All connected all good. N4, N24 & N74 No power to Y1 wire detected. Both thermostats have a Home/Away setting that detects whether you are in or out of the house and adjusts the temperatures accordingly. Please try to re-seat the Y1 cable from your base making sure it is tight. 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