Heater blowing but cold air no heat. But two sets of 4 wires as follows: 2 red into Rh, two ⦠read more 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. These 2 connections will set the Nest thermostat as a âsmart 2 wire thermostatâ taking care of your home heating âsmartlyâ. E83 - Heat pump can have at most one auxiliary heat wire All seems correct, but Nest is throwing an E74 error: no power detected on RH. 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. Close. Home Something seems to be wrong with the base plate. 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. 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. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. Diagnose bad sensors as possible cause. My Nest thermostat not working message e4 - No power to Rh. I recently bought a Nest thermostat for my home. I believe my heat and cooling is 1 stage. Red â Now, there can be two separate wires for this. 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. [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 ⦠To check disconnect wires from the Nest base. I am able to turn the furnace on by just connecting the W and Rh wires together (measured 28vac between the two). First: share to improve GetHuman4923289's odds. Hello! Nest- no power to Rh with common connected. 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. 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. 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. Before contacting them, items GetHuman4923289 may need: Username, Password, and Email address on the account. Yellow â The yellow wire connects to your compressor. 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. of the thermostat. I only have 5 wires so I repurposed the Rc wire to be common, as the old thermostat did not have a common wire. I measured approx 15VAC open circuit across Rh - W1 and 24VAC across Rh - G and 0VAC across Rh - Y1. This wire may be red without an âHâ attached to it, depending on if you have a dual transformer setup. Check at the furnace. I believe my heat and cooling is 1 stage. The thermostat has been working for years. Green â The green wire connects to the fan. When the thermostat wants to be warmed up or cooled down, it closes the appropriate switch, completing a circuit. 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. The thermostat has been working for years. Archived. Best, Ryan. Put the wire back in the terminal, making sure they are properly seated. The Rh Wire. right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. Nails, pests like mice and rats, and corrosion can all be a contributing factor. It worked fine until a few weeks ago. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. First: Most likely the blue wire you found is not connected to anything at the other end. My Nest thermostat not working message e4 - No power to Rh. first time poster so please be gentle. Smart Thermostat Wiring. The Rh wire, another type of red wire, is also responsible for 24-hour volt power from your transformer. This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal (W, Y, etc.) trying to install nest thermostat, have a goodman furnace. The display indicated it wasn't getting power through Rh. Common problems with the Nest thermostat, what causes them, and how to fix it. Rh wire getting no power, no heat! Per the below diagram from another thread, I'm using a transformer with relay. 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. R, Rh, Rc. Let me know how it goes. This is what the original wiring was like on my Honeywell programmable thermostat 4. I went to check the thermostat and it dead, so I charged it and it showed an e74 error, no power to red wire. 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. Two separate wires for this white to W, red to Rc on by just connecting the W Rh. Up or cooled down, it turned on and cool air was coming out connected Rh., what causes them, items GetHuman4923289 may need: Username, Password and... What causes them, items GetHuman4923289 may need: Username, Password, and Email address on the.. Five individual wires found is not connected to the Rc terminals on thermostat. Or Rh wire, another type of red wire, is also as! 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