Nest Rh Wire No Power E74 »

12/10/2016 · Intermittent no power on Rh, e74. We swapped the Y1 and W1 wires and it appears that the issue followed the wire so the Nest tech concluded the Nest was not the issue. The Voc and Vin are always above 30VAC although the voltage swing seems large i.e. 37VAC down to 30VAC at times. Okay so I have had my 3rd Gen Nest thermostats three of them for 2 years. The two units I have on my lower floors pose no problem and are simple 2-wire heat-only configurations. The one upstairs, which was my original purchase is now no longer calling for heat in that zone and is displaying E74 no power to Rh wire. 06/10/2013 · 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. I put the AC on late last night, it turned on and cool air was coming out. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed.meaning no power to Rh wire detected. 25/02/2017 · There were additional wires in the cable, but they were not hooked up at either end. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. When I hook up the blue wire to the C terminal on the Nest base, I get the red symbol indicating no power to Rh.but if I remove the common, it all works fine. The other I only recorded voltage on the RH wire and this one constantly runs the heat out of control. Came home to 100 temperature Fahrenheit. Both worked fine for about 5 months. Then my heat pump crashed 27 year old system shortly after having it replaced the Nest connected stopped working due to no battery charge and my other Nest went.

Nest Wiring Issue, RH showing no power when C is connected. So I just purchased a nest, and it doesn't detect my RH wire when I have the C wire in. This is what the original wiring was like on my Honeywell programmable thermostat. I have a nest and am getting the e73 error saying no power to the rh wire, had it installed a few months ago, was - Answered by a verified HVAC Technician. How to attach a wet/dry vac to a condensate drain line. You can simply put the end of the wet vac hose over the PVC pipe and use your hand to cover the remaining opening to create a seal.

Central Air Unit not Sending Enough Power to Thermostat. Ask Question Asked 3 years,. The wire contains one hot wire Rh,. the Nest tries to power itself without a C wire by leaking a bit of power through the big clunky old relay that switches on the furnace, fan or A/C. My nest thermostat tells me there is no power to the RH. I have done all the suggested troubleshooting, yet my furnace does not go on. Battery 38 Voc 38.65 Vin 8.4. I can press the restart button and my furance goes on, but turns off after a few minutes. The vin doesn't get above 8.4 and slowly goes down to 6 and my furnace then turns off. I have a similar issue where I was replacing a working thermostat with a nest thermostat and the nest thermostat states there is no power to the Rh wire. I replaced the.

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