N3 N23: No power to Wlwire detected. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base. Choose a product. There aren’t any standards for wire colors. 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. EitherRcorRhmust be connected for Nest Thermostat to work. It worked fine until a few weeks ago. Your Nest isn’t electrically detecting your Rh wire, but one is connected to the Nest base. Effectively there isn't a second RH wire, although there is an RH terminal. Here's what I'm seeing on the Nest: [ATTACH]75481[/ATTACH] [ATTACH]75482[/ATTACH] Despite this power error, the Nest does seem to be responding to the transformer being plugged in or unplugged: i.e. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. -Check all the wires and their connections making sure they are properly secure at the Nest and on the unit.-Check continuity of all wires from Nest to unit-power off.-Remove C wire, nut it off so it doesn't touch any other wires, flip breaker back on.-Remove Nest, try charging it … You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. 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. For instance, the Nest Thermostat and the Nest E Thermostat can usually run without a common wire — see below for more information. FI don't know. I put the AC on late last night, it turned on and cool air was coming out. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. N6 N26: No power to G wire detected. At this point Nest charges nicely from the C wire, but cannot turn heater on because no power to Rh. thats a few things to check but it sounds like you already have help from a tech on the way. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Free shipping: Time left. If that doesn’t work, try putting the red wire in the Rc port to see if it registers. We have the nest thermostat and its saying RH wire is not receiving power Our nest thermostat says there is no power Nest thermostat is losing the power no power on new nest thermostat FIX: We fixed it, it is fix, or repaired by a human being, an robot might have fix Need a nest thermostat for ac and heat. Other thermostats, like the Ecobee, come with an adapter that can be used if you already have four wires, but no common wire — Ecobee thermostats are also discussed below. at NEST THERMOSTAT INSTALLATION & WIRING (found by searching in the search box just above for Nest Thermostat Wiring) Watch out: indeed the Nest and other low-voltagee thermostats usually require power from a low-voltage transformer that you may need to add and wire to your system. Here are common uses and preferred colors for these wires: R terminal will use the red wire. Power coming from the C wire in the Rc port to see if it registers it sounds like you have... 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