You should verify that the X wire on the old thermostat is not a common wire. I recently bought a Nest thermostat for my home. (Heat) 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. ... Christmas Day New Nest Thermostat wiring. I have Rh Rc Y W G. The nest is not detecting the RH Wire when inserted. Advertisement 35. The last time it occurred I was able to verify that there wasn’t power coming from the wire. 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. Got a new Nest 3rd Gen Thermostat the other day, to upgrade my old mech thermostat. The Nest tech is incorrect - There is power to the thermostat. (Air conditioner) W terminal will use the white wire. 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. ... I’ve been having a similar issue with my Rh wire on the gen 3 device. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. G terminal will use the green wire. first time poster so please be gentle. If that doesn’t work, try putting the red wire in the Rc port to see if it registers. (Fan) Y terminal will use the yellow wire. Furnace is a Lennox 80UHG with a Surelight Integrated control board. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . 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. It worked fine until a few weeks ago. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? Hello! 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. ="width:120px;height:240px;" marginwidth="0" … E83 - Heat pump can have at most one auxiliary heat wire keep wire configuration as told - powered from the AC trans only . Power comes through the red wire to Rh. Archived. Use a Common Wire With a Nest Thermostat (or Suffer the Consequences) ... as the detection of the Rc and Rh was transient at best. 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. When we jumped Rh to G and the fan came on that verified that there is power through the red wire. FI don't know. Contractor's Assistant: Do you plan on doing the work yourself? 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. - 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. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. I put the AC on late last night, it turned on and cool air was coming out. If Heat does not turn on , try Rc to Rh wire switch , if AC or heat does not then base is no good , order new base from nest. 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