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. I have Rh Rc Y W G. The nest is not detecting the RH Wire when inserted. When we jumped Rh to G and the fan came on that verified that there is power through the red wire. It worked fine until a few weeks ago. - 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. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. Posted by 3 years 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. 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. 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. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? 1. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. You should verify that the X wire on the old thermostat is not a common 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.) If that doesn’t work, try putting the red wire in the Rc port to see if it registers. Furnace is a Lennox 80UHG with a Surelight Integrated control board. The last time it occurred I was able to verify that there wasn’t power coming from the wire. No power to R wire (randomly) Close. first time poster so please be gentle. Contractor's Assistant: Do you plan on doing the work yourself? I recently bought a Nest thermostat for my home. The Nest tech is incorrect - There is power to the thermostat. ... Christmas Day New Nest Thermostat wiring. G terminal will use the green wire. 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. Advertisement Power comes through the red wire to Rh. (Air conditioner) W terminal will use the white wire. (Fan) Y terminal will use the yellow wire. (Heat) Nest separates these two, but if there’s only one wire, it should go into the Rh port. E83 - Heat pump can have at most one auxiliary heat wire ="width:120px;height:240px;" marginwidth="0" … 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. 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. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . ... I’ve been having a similar issue with my Rh wire on the gen 3 device. keep wire configuration as told - powered from the AC trans only . Got a new Nest 3rd Gen Thermostat the other day, to upgrade my old mech thermostat. 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. 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