Archived. ="width:120px;height:240px;" marginwidth="0" … (Heat) Hello! Contractor's Assistant: Do you plan on doing the work yourself? ... I’ve been having a similar issue with my Rh wire on the gen 3 device. 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. 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.) 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. 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. ... Christmas Day New Nest Thermostat wiring. 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. - 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. No power to R wire (randomly) Close. Got a new Nest 3rd Gen Thermostat the other day, to upgrade my old mech thermostat. 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. You should verify that the X wire on the old thermostat is not a common wire. (Fan) Y terminal will use the yellow wire. G terminal will use the green wire. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. 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. The Nest tech is incorrect - There is power to the thermostat. 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. 35. It worked fine until a few weeks ago. I recently bought a Nest thermostat for my home. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? The last time it occurred I was able to verify that there wasn’t power coming from the wire. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . When we jumped Rh to G and the fan came on that verified that there is power through the red wire. I put the AC on late last night, it turned on and cool air was coming out. 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 have Rh Rc Y W G. The nest is not detecting the RH Wire when inserted. Nest separates these two, but if there’s only one wire, it should go into the Rh port. Power comes through the red wire to Rh. Posted by 3 years ago. FI don't know. 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. E83 - Heat pump can have at most one auxiliary heat wire keep wire configuration as told - powered from the AC trans only . 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