Google user. 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. Contractor's Assistant: Do you plan on doing the work yourself? One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. I believe my heat and cooling is 1 stage. There were additional wires … These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. E83 - Heat pump can have at most one auxiliary heat wire Then a few days ago, my heat stopped working at night. 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. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. Breaker fine, fuse fine. recommended this. I went to check the thermostat and it dead, so I charged it and it showed an e74 error, no power to red wire. Red/R* – power wire for your heating and cooling system. Orange – This wire connects to your heat pump (if you have one). Red – Now, there can be two separate wires for this. first time poster so please be gentle. In some systems, both the heating and cooling systems use their own signal voltage. Nails, pests like mice and rats, and corrosion can all be a contributing factor. The Rh wire connects to your heating system as opposed to your cooling system. The thermostat has been working for years. This is what the original wiring was like on my Honeywell programmable thermostat - 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. My Nest thermostat not working message e4 - No power to Rh. Sometimes condensate overflow or low on refrigerant. I recently bought a Nest for my home. 4. I believe my heat and cooling is 1 stage. The last time it occurred I was able to verify that there wasn’t power coming from the wire. NEST Thermostat … first time poster so please be gentle. The purpose of the battery is to power the Nest interface even when … I recently bought a Nest thermostat for my home. 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. R, Rh, Rc. Nest- no power to Rh with common connected. 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. Label the wires Peel off the labels below and attach them to the thermostat’s matching wires. 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. Furnace is a Lennox 80UHG with a Surelight Integrated control board. But two sets of 4 wires as follows: 2 red into Rh, two … read more My Nest thermostat not working message e4 - No power to Rh. IMPORTANT: If you have Rh and Rc wires, you have a dual transformer system. This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal (W, Y, etc.) right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. Add to Wish List Compare this Product. Effectively there isn't a second RH wire, although there is an RH terminal. This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. Before contacting them, items GetHuman4923289 may need: Username, Password, and Email address on the account. The display indicated it wasn't getting power through Rh. Hello! Rh wire getting no power, no heat! 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. Yellow – The yellow wire connects to your compressor. When the thermostat wants to be warmed up or cooled down, it closes the appropriate switch, completing a circuit. Help with my Nest issue. I measured approx 15VAC open circuit across Rh - W1 and 24VAC across Rh - G and 0VAC across Rh - Y1. Description; Why is my Nest thermostat not working with AC? Hello! of the thermostat. This morning, when I walked by nest, it had a Wiring Report message with E24 displayed...meaning no power to Rh wire detected. trying to install nest thermostat, have a goodman furnace. I have had a gen 3 for more than a year hooked up, no issues. Let me know how it goes. How to Fix the Clogged Condensate Drain Line. 6. 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. Companies respond better when others are watching. The Rh Wire. Note: If you have an Rc or Rh wire, put the R label on it. 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. Smart Thermostat Wiring. Original Poster. I only have 5 wires so I repurposed the Rc wire to be common, as the old thermostat did not have a common wire. So I got my Fluke meter out and did some investigating. Posted by 2 years ago. 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 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. Best, Ryan. Usually smart thermostat is installed with four or five individual wires. Home I put the AC on late last night, it turned on and cool air was coming out. … Furnace is a Lennox 80UHG with a Surelight Integrated control board. Then twist together the Rh, G, and Y1. Second: No power to Y1 is an indication of a problem with the AC. I am able to turn the furnace on by just connecting the W and Rh wires together (measured 28vac between the two). Common problems with the Nest thermostat, what causes them, and how to fix it. 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. 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. Something seems to be wrong with the base plate. 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. All seems correct, but Nest is throwing an E74 error: no power detected on RH. 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. Each of these wires has a name featuring a single letter (listed below). Per the below diagram from another thread, I'm using a transformer with relay. First: share to improve GetHuman4923289's odds. To check disconnect wires from the Nest base. I’ve been having a similar issue with my Rh wire on the gen 3 device. 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. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Not sure why it works like that. 6 wires coming from wall, only using 4 on it. White to W, red jumper from Rh to Rc, Green to G, Yellow to Y, Red to Rc. FI don't know. After doing so, please restart your Nest device by pressing the display for about 10 seconds. The thermostat is telling me no power to RH wire detected GetHuman4923289's customer service issue with Nest from June 2020. Check at the furnace. Green – The green wire connects to the fan. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. 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. 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