Heater blowing but cold air no heat. first time poster so please be gentle. R, Rh, Rc. Just got the nest and having issues with Rh power. Rh wire getting no power, no heat! The thermostat is telling me no power to RH wire detected GetHuman4923289's customer service issue with Nest from June 2020. Breaker fine, fuse fine. 6 wires coming from wall, only using 4 on it. ="width:120px;height:240px;" marginwidth="0" … Hello! first time poster so please be gentle. Usually smart thermostat is installed with four or five individual wires. How to Fix the Clogged Condensate Drain Line. Original Poster. 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. It worked fine until a few weeks ago. Best, Ryan. 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. Furnace is a Lennox 80UHG with a Surelight Integrated control board. The thermostat has been working for years. Help with my Nest issue. After doing so, please restart your Nest device by pressing the display for about 10 seconds. 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. I went to check the thermostat and it dead, so I charged it and it showed an e74 error, no power to red wire. Note: If you have an Rc or Rh wire, put the R label on it. All seems correct, but Nest is throwing an E74 error: no power detected on RH. 6. I measured approx 15VAC open circuit across Rh - W1 and 24VAC across Rh - G and 0VAC across Rh - Y1. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? My Nest thermostat not working message e4 - No power to Rh. recommended this. Google user. Before contacting them, items GetHuman4923289 may need: Username, Password, and Email address on the account. NEST Thermostat … You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. However, with the system wired this way, the Nest is telling me that No Power to Rh Wire Detected (R24). Check at the furnace. I suggest to turn off your breakers and remove the Nest thermostat display and remove the wire in the Rh or Rc terminal. This is what the original wiring was like on my Honeywell programmable thermostat Nest- no power to Rh with common connected. 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. First: Most likely the blue wire you found is not connected to anything at the other end. Diagnose bad sensors as possible cause. Then a few days ago, my heat stopped working at night. Note: If you are removing an existing thermostat, remove any jumper wires between R and RH or RC and RH. The purpose of the battery is to power the Nest interface even when … The Rh wire connects to your heating system as opposed to your cooling system. E83 - Heat pump can have at most one auxiliary heat wire So I got my Fluke meter out and did some investigating. 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. Nails, pests like mice and rats, and corrosion can all be a contributing factor. To check disconnect wires from the Nest base. Hello! Posted by 2 years ago. Companies respond better when others are watching. Not sure why it works like that. Contractor's Assistant: Do you plan on doing the work yourself? IMPORTANT: If you have Rh and Rc wires, you have a dual transformer system. Each of these wires has a name featuring a single letter (listed below). 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. Home Yellow – The yellow wire connects to your compressor. I have power to RH, the W and the C and the G are connected, voltmeter confirms there is 24 volts between RH & C, RH & W, RH & G, but still getting E24 , could it be a bad nest… The Rh Wire. 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. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. In some systems, both the heating and cooling systems use their own signal voltage. [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 … The thermostat has been working for years. This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. I am able to turn the furnace on by just connecting the W and Rh wires together (measured 28vac between the two). I’ve been having a similar issue with my Rh wire on the gen 3 device. However, when both the C and Rh wires are connected to the Nest base plate, I get no voltage across the wires. The display indicated it wasn't getting power through Rh. Smart Thermostat Wiring. Effectively there isn't a second RH wire, although there is an RH terminal. … Label the wires Peel off the labels below and attach them to the thermostat’s matching wires. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. The Rh wire, another type of red wire, is also responsible for 24-hour volt power from your transformer. My Nest thermostat not working message e4 - No power to Rh. I put the AC on late last night, it turned on and cool air was coming out. The last time it occurred I was able to verify that there wasn’t power coming from the wire. 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. Green – The green wire connects to the fan. There were additional wires … Rh wire getting no power, no heat! Rc wires connect to the RC terminals on your thermostat. The Nest Thermostat E is not compatible with dual transformer systems, but you may be able to use the 3rd generation Nest Learning Thermostat. First: share to improve GetHuman4923289's odds. Second: No power to Y1 is an indication of a problem with the AC. I recently bought a Nest for my home. Close. 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. 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. Common problems with the Nest thermostat, what causes them, and how to fix it. White to W, red jumper from Rh to Rc, Green to G, Yellow to Y, Red to Rc. of the thermostat. Strength in numbers! I recently bought a Nest thermostat for my home. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. Put the wire back in the terminal, making sure they are properly seated. I only have 5 wires so I repurposed the Rc wire to be common, as the old thermostat did not have a common wire. 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. I believe my heat and cooling is 1 stage. 4. But two sets of 4 wires as follows: 2 red into Rh, two … read more Archived. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. trying to install nest thermostat, have a goodman furnace. Red – Now, there can be two separate wires for this. - 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. 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. Let me know how it goes. 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. 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. This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal (W, Y, etc.) FI don't know. Red/R* – power wire for your heating and cooling system. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Sometimes condensate overflow or low on refrigerant. 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. 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. Then twist together the Rh, G, and Y1. 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. 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. Something seems to be wrong with the base plate. Add to Wish List Compare this Product. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. I believe my heat and cooling is 1 stage. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. Dex Landreth. Furnace is a Lennox 80UHG with a Surelight Integrated control board. E82 - No power to W1 wire detected: The Nest Thermostat is physically detecting a wire in the W1 connector but isn't detecting any power to it. Description; Why is my Nest thermostat not working with AC? 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