Prior to installation, I used a multimeter to test the voltage running to the doorbell which read a consistent 16.1 VAC. I just purchased and installed a new Nest Hello. More importantly, my furnace has been running properly and the NEST has remained network connected the whole time. The battery voltage should be the first number you see. A manual reset of the Nest thermostat seems to be working for most people with these annoying issues. Why doesn’t my Nest Hello Doorbell ring? The air conditioner and gas furnace work perfectly fine. If you want a Nest Hello doorbell, you have to have that low-voltage wire or you're out of luck. Ring has one as an add‑on (and we didn't like it much). If your indoor chime is not making a sound, or it’s barely audible, there’s quite a few reasons which could be causing this. Is this lower amount of voltage alright for use with a modern thermostat that requires the 24 volts flow on the C wire back to the air handler board? Shorted turns cause the turns ratio from primary to secondary to change and thus an output voltage change. Also, we don't know how much it will cost yet. I want to replace the cameras with Nest Cam IQ Outdoor cameras, so I purchased one to see what I could do. I purchased a Nest thermostat and it will not work properly at these unusual voltages. The voltage between R and C is only 15-16 volts. In some cases, this may cause the device to respond slowly or become unresponsive,” a Nest spokesperson told Gizmodo. The Venstar Add-a-Wire is an inexpensive adapter that turns a four-wire system into a five-wire system.. One more alternative: get a smart thermostat that’s designed to work with systems lacking a C-wire.Check out the ecobee line of thermostats – all ecobees ship with an adapter for C-wireless systems. I took it off and reinstalled it to make sure I wasn't shorting any wires. “We are aware of a low-battery issue impacting some Nest Thermostat owners. If the voltage is above 3.6, you're good. The most likely is a low voltage supply, however, which means that the doorbell is ‘eating’ the power and there’s not enough ‘left’ for the chime to ring. If some portion of the turns were shorted the ratio could be reduced to 4.31:1 resulting in the 27.81VAC that you see. Nest Hello reading too low voltage. And Nest was a little vague about the related doorbell chime that you will need in order to hear the doorbell inside. No such luck. My conclusion is that since wiring the NEST with 24 Vac common solves the charging/low voltage problem completely, and since it relatively easy to implement, why isn’t this the recommended method of installing the NEST. After installation, I was getting the blinking yellow light. The Nest will talk to their servers over wifi (enabling remote control of the thermostat from anywhere), and is talking to my network fine. Shouldn't I be measuring 24V+/-? Update: Model: N8MSN0701716A Supply Voltage… For example if the line voltage is 120VAC the turns ratio of a functioning transformer would be 5:1 to get to 24VAC. I measured the voltage at the thermostat Rc to G and Rc to Y terminals, and they read 16.2V and 16.34V respectively. It turns off the wifi radio when the battery level gets too low - which happens when the temperatures are such that the AC / Heat doesn't have to kick on for a few days due to nice weather. If the voltage is low, there may be a wiring problem and your Nest may not be charging properly. My hope was I could splice the included USB-C cable to my existing low voltage wires, supply the correct voltage at the multi-channel power supply box and be on my way. The Nest complains about a low battery and wants to shut down; If you have any of these symptoms, please try these simple steps to return your Nest thermostat to a working status. 4.31:1 resulting in the 27.81VAC that you see the line voltage is 3.6. 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