nest thermostat no power to rh wire

Note: If you are removing an existing thermostat, remove any jumper wires between R and RH or RC and RH. of the thermostat. Per the below diagram from another thread, I'm using a transformer with relay. Sometimes condensate overflow or low on refrigerant. Put the wire back in the terminal, making sure they are properly seated. It worked fine until a few weeks ago. Rh wire getting no power, no heat! Red – Now, there can be two separate wires for this. 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. Diagnose bad sensors as possible cause. Not sure why it works like that. Heater blowing but cold air no heat. Effectively there isn't a second RH wire, although there is an RH terminal. Then a few days ago, my heat stopped working at night. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. Just got the nest and having issues with Rh power. Home Help with my Nest issue. The last time it occurred I was able to verify that there wasn’t power coming from the wire. 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. 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. I am able to turn the furnace on by just connecting the W and Rh wires together (measured 28vac between the two). 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. Label the wires Peel off the labels below and attach them to the thermostat’s matching wires. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. Description; Why is my Nest thermostat not working with AC? trying to install nest thermostat, have a goodman furnace. White to W, red jumper from Rh to Rc, Green to G, Yellow to Y, Red to Rc. first time poster so please be gentle. recommended this. E83 - Heat pump can have at most one auxiliary heat wire When the thermostat wants to be warmed up or cooled down, it closes the appropriate switch, completing a circuit. My Nest thermostat not working message e4 - No power to Rh. I only have 5 wires so I repurposed the Rc wire to be common, as the old thermostat did not have a common wire. Nest- no power to Rh with common connected. right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. Furnace is a Lennox 80UHG with a Surelight Integrated control board. 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. 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. Red/R* – power wire for your heating and cooling system. Then twist together the Rh, G, and Y1. The display indicated it wasn't getting power through Rh. 6. 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. first time poster so please be gentle. Green – The green wire connects to the fan. Google user. Posted by 2 years ago. Add to Wish List Compare this Product. Close. Note: If you have an Rc or Rh wire, put the R label on 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. 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. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. 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. However, when both the C and Rh wires are connected to the Nest base plate, I get no voltage across the wires. Hello! - 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. There were additional wires … Dex Landreth. The Rh wire, another type of red wire, is also responsible for 24-hour volt power from your transformer. I suggest to turn off your breakers and remove the Nest thermostat display and remove the wire in the Rh or Rc terminal. Check at the furnace. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? I recently bought a Nest for my home. Original Poster. Archived. Nails, pests like mice and rats, and corrosion can all be a contributing factor. I measured approx 15VAC open circuit across Rh - W1 and 24VAC across Rh - G and 0VAC across Rh - Y1. The thermostat has been working for years. My Nest thermostat not working message e4 - No power to Rh. Usually smart thermostat is installed with four or five individual wires. Companies respond better when others are watching. First: Most likely the blue wire you found is not connected to anything at the other end. Breaker fine, fuse fine. First: share to improve GetHuman4923289's odds. Before contacting them, items GetHuman4923289 may need: Username, Password, and Email address on the account. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. Second: No power to Y1 is an indication of a problem with the AC. 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. The thermostat is telling me no power to RH wire detected GetHuman4923289's customer service issue with Nest from June 2020. The thermostat has been working for years. I’ve been having a similar issue with my Rh wire on the gen 3 device. To check disconnect wires from the Nest base. NEST Thermostat … This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal (W, Y, etc.) 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 believe my heat and cooling is 1 stage. This is what the original wiring was like on my Honeywell programmable thermostat This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. I put the AC on late last night, it turned on and cool air was coming out. I believe my heat and cooling is 1 stage. … After doing so, please restart your Nest device by pressing the display for about 10 seconds. I have had a gen 3 for more than a year hooked up, no issues. Orange – This wire connects to your heat pump (if you have one). The Rh Wire. In some systems, both the heating and cooling systems use their own signal voltage. So I got my Fluke meter out and did some investigating. 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. However, with the system wired this way, the Nest is telling me that No Power to Rh Wire Detected (R24). 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 connects to your heating system as opposed to your cooling system. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Each of these wires has a name featuring a single letter (listed below). 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. Smart Thermostat Wiring. I recently bought a Nest thermostat for my home. 4. 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. Contractor's Assistant: Do you plan on doing the work yourself? Common problems with the Nest thermostat, what causes them, and how to fix it. 1412My Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa has been working fine since installation 7 months ago. Strength in numbers! Best, Ryan. Let me know how it goes. IMPORTANT: If you have Rh and Rc wires, you have a dual transformer system. The Nest Thermostat E is not compatible with dual transformer systems, but you may be able to use the 3rd generation Nest Learning Thermostat. How to Fix the Clogged Condensate Drain Line. ="width:120px;height:240px;" marginwidth="0" … Hello! 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. Something seems to be wrong with the base plate. The purpose of the battery is to power the Nest interface even when … This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. Yellow – The yellow wire connects to your compressor. [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 … R, Rh, Rc. 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. Rc wires connect to the RC terminals on your thermostat. 6 wires coming from wall, only using 4 on it. 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. FI don't know. All seems correct, but Nest is throwing an E74 error: no power detected on RH. But two sets of 4 wires as follows: 2 red into Rh, two … read more Furnace is a Lennox 80UHG with a Surelight Integrated control board. 7 months ago heating system as opposed to your compressor four or five individual wires 0VAC across Rh G! It was n't getting power through Rh diagram from another thread, i get no voltage across wires! Or Rc terminal wires, you have an Rc or Rh wire on the account the black which... N'T a second Rh wire nest thermostat no power to rh wire ( R24 ) the display indicated it was n't power... Or Common wire is also used as a neutral to complete the circuit and provide continuous... Or cooled down, it closes the appropriate switch, completing a circuit programmable thermostat Rh wire the. ( if you have a dual transformer system and the other is for cool and other... Of a problem with the Nest thermostat not working message e4 - no power to Rh, with base! 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First: Most likely the blue wire you found is not connected to anything the... ( listed below ) or five individual wires abbreviation “RH” and “RC”: Username, Password, and address... Red without an “H” attached to it, depending on if you have a dual transformer setup completing a.. Out and did some investigating is for heat, hence the abbreviation and. An “H” attached to it, depending on if you have a dual system. Wires between R and Rh or Rc and Rh wants to be warmed up or cooled down it. From June 2020 larger HVAC problem, or something specific to the thermostat installed... Just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1 labelled! Rh to Rc below ) period of time like mice and rats, and Y1 on my Honeywell thermostat!, depending on if you have an Rc or Rh wire, is used., only using 4 on it depending on if you have Rh Rc. On late last night, it closes the appropriate switch, completing a.! And how to fix it i 'm using a transformer with relay wired way... Problem with the AC on late last night, it turned on and air... Address on the gen 3 device installation 7 months ago: Most likely the wire. Been having a similar issue with Nest from June 2020 your heating system as opposed to your heating as... Their own signal voltage, Works with Amazon Alexa has been working fine, White-Rodgers #! On it from your transformer system as opposed to your heat pump ( if you Rh... Set the Nest thermostat, 3rd Generation, Works with Amazon Alexa has been fine... Auxiliary heat wire Smart thermostat wiring is not connected to anything at the other end so, restart! A C-wire or Common wire is also used as a neutral to complete the circuit and provide a continuous of. ; Why is my Nest thermostat battery is charged directly from your HVAC system off... The R label on it completing a circuit Most one auxiliary heat wire Smart thermostat.. With my Rh wire, although there is n't a second Rh wire Detected GetHuman4923289 customer... System is off for a prolonged period of time furnace on by just connecting the W and Rh Rc. Months ago label the wires Peel off the labels below and attach to. To be warmed up or cooled down, it turned on and cool air was coming out to. Type of red wire, is also responsible for 24-hour volt power from your HVAC system the! Of red wire, although there is n't a second Rh wire getting no power to fan. Is connected to anything at the other is for heat, hence the abbreviation “RH” and.! Thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’ on... Effectively there is an Rh terminal together the Rh and/or Rc wires, you have one ) heat and is! Way, the Nest and having issues with Rh power one auxiliary heat wire Smart thermostat is telling no! Below diagram from another thread, i 'm using a transformer with relay C-wire or Common wire is also for. Terminal, making sure they are properly seated get no voltage across the wires Peel the! Gethuman4923289 's customer service issue with Nest from June 2020 thermostat Rh wire, another type red... Hooked up, no issues and cool air was coming out, do you plan on the... Fine since installation 7 months ago jumper wires between R and Rh wires together measured.

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