Use a Common Wire With a Nest Thermostat (or Suffer the Consequences) ... as the detection of the Rc and Rh was transient at best. G terminal will use the green wire. Archived. I naively thought that I could just move the Rh wire to Rc and the W1 wire to Y1, then move the independent transformer wires to C and Rh, but it doesn't seem to work. It detects Rc, however it is getting cold here and I believe my AC cuts off at a certain temp, so the thermostat stops working once that occurs. ... Christmas Day New Nest Thermostat wiring. Having an odd issue. keep wire configuration as told - powered from the AC trans only . I have Rh Rc Y W G. The nest is not detecting the RH Wire when inserted. Update Amazon now offers free in home Smart Home Consultation When I removed the old thermostat, the wires were connected to W1, Rh and G. The Nest would not stay charged, so I read enough to realize I would need a common wire. 35. I put the AC on late last night, it turned on and cool air was coming out. first time poster so please be gentle. - No power to Y1 wire detected: The Nest Thermostat is physically detecting a wire in the Y1 connector but isn't detecting any power to it. E83 - Heat pump can have at most one auxiliary heat wire 1. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. ... I’ve been having a similar issue with my Rh wire on the gen 3 device. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . ="width:120px;height:240px;" marginwidth="0" … (Heat) If that doesn’t work, try putting the red wire in the Rc port to see if it registers. No power to R wire (randomly) Close. Got a new Nest 3rd Gen Thermostat the other day, to upgrade my old mech thermostat. Contractor's Assistant: Do you plan on doing the work yourself? Hello! You should verify that the X wire on the old thermostat is not a common wire. FI don't know. (Air conditioner) W terminal will use the white wire. If there is a common wire installed the Nest Thermostat will not power share: When X, W1 or W2 is an AUX wire: Some heat pump installations may have the auxiliary heat connection labelled as X, W1 or W2 on the thermostat. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? It worked fine until a few weeks ago. E82 - No power to W1 wire detected: The Nest Thermostat is physically detecting a wire in the W1 connector but isn't detecting any power to it. When we jumped Rh to G and the fan came on that verified that there is power through the red wire. Take your 24v transformer put one wire in Rh the other in C. Connect a 2nd wire to C and run that to one terminal on the power side of the relay, connect a wire to W1 on the thermostat and run that to the other terminal on the power side of your relay… Then connect the two wires you set aside to the normally open side of your relay. Nest separates these two, but if there’s only one wire, it should go into the Rh port. Sure the Nest displays cooling mode when I connect the Rc and Y1 wires but when I connect the power wires to C and Rh - it complains that there's no power to C. My Nest Thermostat said "No power to RH wire detected" I have tried turning circuit breaker on and off No luck The nest thermostat has gone all black now, like it is not on. (Fan) Y terminal will use the yellow wire. Rc: Power for cooling Rh: Power for heating C terminal will use the blue or black wire (Common wire, It enables the continuous flow of 24 v AC from the Red wire.) Furnace is a Lennox 80UHG with a Surelight Integrated control board. 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