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