Breaker fine, fuse fine. Each of these wires has a name featuring a single letter (listed below). I recently bought a Nest for my home. Use a common wire with a Nest thermostat or suffer the consequences (electronicdesign.com) The Nest Thermostat Rant Page (greyghost.mooo.com) When doing your own research on the Nest pulsing problem, look for terms like: pulsing, cycling, short cycle, power leeching, no c-wire, heat-only and cooling-only. R, Rh, Rc. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. Second: No power to Y1 is an indication of a problem with the AC. It worked fine until a few weeks ago. First: Most likely the blue wire you found is not connected to anything at the other end. Then twist together the Rh, G, and Y1. Contractor's Assistant: Do you plan on doing the work yourself? This is what the original wiring was like on my Honeywell programmable thermostat How to Fix the Clogged Condensate Drain Line. First: share to improve GetHuman4923289's odds. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Something seems to be wrong with the base plate. The Rh Wire. Description; Why is my Nest thermostat not working with AC? Red – Now, there can be two separate wires for this. To check disconnect wires from the Nest base. I have had a gen 3 for more than a year hooked up, no issues. Per the below diagram from another thread, I'm using a transformer with relay. first time poster so please be gentle. When the thermostat wants to be warmed up or cooled down, it closes the appropriate switch, completing a circuit. Let me know how it goes. Original Poster. Diagnose bad sensors as possible cause. Hello! Companies respond better when others are watching. Rc wires connect to the RC terminals on your thermostat. I suggest to turn off your breakers and remove the Nest thermostat display and remove the wire in the Rh or Rc terminal. Google user. IMPORTANT: If you have Rh and Rc wires, you have a dual transformer system. I’ve been having a similar issue with my Rh wire on the gen 3 device. Furnace is a Lennox 80UHG with a Surelight Integrated control board. This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. I measured approx 15VAC open circuit across Rh - W1 and 24VAC across Rh - G and 0VAC across Rh - Y1. But two sets of 4 wires as follows: 2 red into Rh, two … read more FI don't know. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. The Nest Thermostat E is not compatible with dual transformer systems, but you may be able to use the 3rd generation Nest Learning Thermostat. Check at the furnace. - 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. OLD THERMOSTAT NEW THERMOSTAT (NEMA standard) DESCRIPTION WIREING FOR NORMAL HEATING AND COOLING (gas/oil/elect) (no heat pump) R, or RH, or 4, or V RC/RH (connected) Single power wire W or H W Heat return W2 or H2 W2 2nd stage of heat W3 W3 3rd stage of heat. 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. [ATTACH]75484[/ATTACH] Two wires ran from the furnace to the old t-stat: [ATTACH]75485[/ATTACH] Now I have the two furnace wires running to the relay (2 wires on left/top): [ATTACH]75478[/ATTACH] Here's a close-up so you can … This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. 4. I have just a simple gas forced air heating and cooling system using just 4 wires to the thermostat- Rh, W1, Y1 and G for heating, cooling and fan control. I am able to turn the furnace on by just connecting the W and Rh wires together (measured 28vac between the two). 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. Another reason why there’s no power to the thermostat could be due to a bad transformer or even a faulty wire running from the thermostat to the transformer. White to W, red jumper from Rh to Rc, Green to G, Yellow to Y, Red to Rc. Best, Ryan. Green – The green wire connects to the fan. Note: If you have an Rc or Rh wire, put the R label on it. Swapping wires in and out of the Nest base seemed to mess up the base, as the detection of the Rc and Rh was transient at best. i think i got the 4 wires correct but im getting just cold air blowing when setting to heat Installing a 3rd gen Nest thermostat. Orange – This wire connects to your heat pump (if you have one). There were additional wires … Rh wire getting no power, no heat! I went to check the thermostat and it dead, so I charged it and it showed an e74 error, no power to red wire. The purpose of the battery is to power the Nest interface even when … A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. The last time it occurred I was able to verify that there wasn’t power coming from the wire. After doing so, please restart your Nest device by pressing the display for about 10 seconds. Effectively there isn't a second RH wire, although there is an RH terminal. Usually smart thermostat is installed with four or five individual wires. trying to install nest thermostat, have a goodman furnace. But two sets of 4 wires as follows: 2 red into Rh, two Yellow into V1, 1 black into W1 and 2 green into G. I have a volt meter and voltage is coming from both red wires. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. E83 - Heat pump can have at most one auxiliary heat wire ="width:120px;height:240px;" marginwidth="0" … So I got my Fluke meter out and did some investigating. I believe my heat and cooling is 1 stage. I put the AC on late last night, it turned on and cool air was coming out. Nest- no power to Rh with common connected. Furnace is a Lennox 80UHG with a Surelight Integrated control board. Not sure why it works like that. Before contacting them, items GetHuman4923289 may need: Username, Password, and Email address on the account. I only have 5 wires so I repurposed the Rc wire to be common, as the old thermostat did not have a common wire. However, with the system wired this way, the Nest is telling me that No Power to Rh Wire Detected (R24). 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. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. The thermostat has been working for years. The thermostat has been working for years. 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. 6. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. Posted by 2 years ago. Add to Wish List Compare this Product. I believe my heat and cooling is 1 stage. NEST Thermostat … If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. In some systems, both the heating and cooling systems use their own signal voltage. The Rh wire connects to your heating system as opposed to your cooling system. Sometimes condensate overflow or low on refrigerant. Put the wire back in the terminal, making sure they are properly seated. Note: If you are removing an existing thermostat, remove any jumper wires between R and RH or RC and RH. Close. Rh wire getting no power, no heat! Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal (W, Y, etc.) You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. recommended this. If the Nest thermostat isn't getting enough power from W or Y and there is no Common wire: While we find that in the vast majority of homes the Nest Thermostat can charge its built in battery by power sharing from the regular heating and cooling wires. Hello! Smart Thermostat Wiring. Archived. The thermostat is telling me no power to RH wire detected GetHuman4923289's customer service issue with Nest from June 2020. My Nest thermostat not working message e4 - No power to Rh. … when put in right places the switches on display show red for Rh and Rc right now as connected and shown I'm images, everything works except heat. Red/R* – power wire for your heating and cooling system. Use a wet/dry shop vac to remove the clog by placing it in wet mode (remove the filter) and attaching it to the end of the condensate drain line. Then a few days ago, my heat stopped working at night. Just got the nest and having issues with Rh power. of the thermostat. Strength in numbers! I used a multimeter to test voltage across the wires at the thermostat; when the C wire is not connected to the Nest base and the power (Rh) wire is connected to the Rh terminal on the base, I get 24 volts across the C and Rh wires. I recently bought a Nest thermostat for my home. Dex Landreth. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. 6 wires coming from wall, only using 4 on it. All seems correct, but Nest is throwing an E74 error: no power detected on RH. Nails, pests like mice and rats, and corrosion can all be a contributing factor. However, when both the C and Rh wires are connected to the Nest base plate, I get no voltage across the wires. Heater blowing but cold air no heat. first time poster so please be gentle. My Nest thermostat not working message e4 - No power to Rh. The display indicated it wasn't getting power through Rh. Common problems with the Nest thermostat, what causes them, and how to fix it. 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