From RC move it to RH. Sometimes it works, sometimes not. 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. 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. 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. Heater blowing but cold air no heat. As soon as I attached yellow blue and green I get the issue. The next day, I tried reconnecting the wires while the power was off and then plugged it back in. If your Nest is reading low power or won't charge it may mean that you need to add a common wire transformer. – Allan Apr 26 '18 at 0:45 Datsun parts for 240Z, 260Z, 280Z, 280ZX, 510, 520, 521, 620, & Fairlady Roadster Thermostat is fairly new. Put The Nest Thermostat back on the wall mounted plate and see what happens. If I disconnect C, it says no power to Y1. I checked the thermostat wire where the worker may have accidentally cut it. Power was restored to Y1, so I thought I fixed it. First: Most likely the blue wire you found is not connected to anything at the other end. 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. Discover connected home devices from Nest – thermostats, indoor and outdoor security cameras, smoke and carbon monoxide alarm, security system, video doorbell and more. If so the O and B wires are unneeded and can be removed from the control panel. 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 … 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. Also, check continuity from the Y1 wire from the stat back to the air handler or furnace. Learn more > Nest.com has moved to the Google Store. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. She has a gas furnace and an A/C unit (no heat pump … read more So I checked and even cut fresh wire just in case there wasn't good contact since the switching of thermostats. I am in the middle of installing a Nest thermostat. Model GMS80704BXCC. 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). Sometimes condensate overflow or low on refrigerant. Does it make sense that the previous homeowner had a y1 wire running to the thermostat at all? current wiring is Rh, W1, C, G, Y1. my daughter has a Honeywell T2060F thermostat and wants to install a NEST thermostat. N4, N24 & N74 No power to Y1 wire detected. Check at the furnace. If I unplug the furnace then reconnect the Y1 wire, it works for about an hour then gives me the warning again. Then about an hour later, I got the warning again. Hello! Learn more at nest.com/e74. Not so sure it was actually cut but I did it anyway. Should I wire my yellow wire to Y1 or Y2? Both thermostats have a Home/Away setting that detects whether you are in or out of the house and adjusts the temperatures accordingly. When I just do red and white for heat all good. Hi everyone. Second: No power to Y1 is an indication of a problem with the AC. Remember, NEST does not recommend using stranded wire, but sometimes this problem can be overcome by the suggestions I made previously. Well during this time, the internal battery will run to, if you take more than one day to fix this. All connected all good. To check disconnect wires from the Nest base. On my new thermostat, there are two separate Y connection points - one called Y1 and the other Y2. N5, N25 & N75 No power to W2/AUX wire detected. Diagnose bad sensors as possible cause. No power to W1 wire detected. So what I would try: Zone 1 R to Nest Rh (24VAC Hot) Zone 1 C to Nest C (24VAC Common) Zone 1 W to Nest W1 (Heat) Zone 1 Y to Nest Y1 (Cool) Zone 1 G to Nest G (Fan) Only thing I don't understand is how the fan gets turned on by the second thermostat in Cool mode. That would be the first thing. 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. 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. Use a Common Wire With a Nest Thermostat. Still same e80 with y1. This video shows how I fixed an error with my Nest thermostat. Your Nest Thermostat isn't electrically detecting your Y1wire, but one is connected to the Nest Thermostat base. I had a question regarding the wiring. 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. Talk to a Google Nest expert. We had to take off the yellow and blue to make it work, but only heat is working. Helping customers save Datsun cars & trucks for future generations to enjoy! This is 100% repeatable. On my old thermostat, the yellow wire was connected to the outlet "Y/Y2". 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. 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. The error is E74 - No power to Rh wire detected. NEST says C wire has no power (was working fine for months). No a/c, just a goodman gas furnace blowing into house thru vents. Heat pump requires a Y1 wire: The Nest Thermostat is physically detecting a wire in the O/B connector. There is no common wire with my system, although there is an extra unpowered white wire that was unused previously. Common problems with the Nest thermostat, what causes them, and how to fix it. Remove red wire from RED. Just because it worked before doesn't mean something couldn't have changed. Looked like it was cut so I coupled the wire together. And when this problem occurs it keeps short cycling my AC. 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 Nest Thermostat No common wire - Nest thermostat needs no common wire -problem solved, How To Connect the nest thermostat without a Common wire. We’re here to help. The Honeywell has a "K" terminal wire where the NEST does not. By turning your breaker on/off actually reset the HVAC power therfore providing power to the Y1 cable. See what happens. 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. Then twist together the Rh, G, and Y1. Your Nest Thermostat isn't electrically detecting your W1wire, but one is connected to the Nest Thermostat base. 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