Remove Rh and G and connect them together with a wire nut or simply twisting together. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. Exact same thing happened to me. Post photos, respond to polls and access other special features. Luckily I have a setup where I have other Nest thermostats so I am just going to change. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. Nest Learning Thermostat Error Codes No power to Rh wire detected. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. The issue is with the upstairs Nest. Furnace is a Lennox 80UHG with a Surelight Integrated control board. N6 N26: No power to G wire detected. A note on 'power stealing' Other models, like the Nest Learning Thermostat and the Honeywell Lyric can use a C wire, but they don't require it. keep wire configuration as told - powered from the AC trans only . I did on the other one pull the deal off and reset the R wire to see if it was that. In general terms, the R terminal is where you connect the signal voltage source. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. Let's take a look at the G wire. It worked fine until a few weeks ago. Learn more at nest.com/e24. keep wire configuration as told - powered from the AC trans only . 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. We got a Nest … You either have to update your Nest Thermostat firmware orrun a C-Wire. There were additional wires in the cable, but they were not hooked up at either end. Choose a product. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. RC is no different and simply means red cooling. Beware of advice given by some guy on the Internet. No power to RH wire detected? Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . I understood that it was a safety precaution to switch off the breaker to the thermostat before touching any of the wires. North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East From RC move it to RH. E2, E22 & E72 No power wires detected.RcorRhwire required. Red/R* – power wire for your heating and cooling system. first time poster so please be gentle. Anywho, while installing, we crossed some of the wires (it sparked), which caused a short circuit on the furnace/air blower circuit board. It worked fine until a few weeks ago. We got a Nest thermostat and were trying to install it ourselves. Yes... we are 20 years old. E2, E22 & E72 No power wires detected.RcorRhwire required. 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. I created a Reddit account just to share this. The jumper between R and Rc might have come out unless it’s an2 transformer type system or the wires shorted and blew the fuse on the furnace board,typically a 3 or 5 amp fuse (low voltage) 354 views Usually the issue is contained to the cooling side. The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. No power to Rh wire detected. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. 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