thermostat red wire no power

Clean your thermostat. My final thought/question would be, at the furnace terminal block, where the Y(yellow) is connected to C, which is where the Blue should go for power, is it safe to connect the BLUE wire and leave the existing Y(yellow) wire on the C? If there is no power to the thermostat then you will need to call a professional electrician to run a new wire from the HVAC unit to the thermostat. I turned the power back on and everything worked great! Connect the new main power terminal block to the range using the two screws. Thank you for sharing your thermostat question with us, If you find that the thermostat is set correctly then consider contacting the company whom you previously paid to rewire the thermostat and ask them if they guarantee their work and allow them the opportunity to correct the thermostat problem. I tried to install a wifi thermostat and when I took the old one off the wall it had the typical Red, yellow, white and green wires, but it did not have a “C” for the wifi thermostat to function. On your control board, you’ll find several terminals that your thermostat will need to be correctly wired into. Some furnace blowers have lubrication points on each side of the blower shaft. I have a thermostat now that has only red and white wires and I am wondering where I put them on my new thermostat? I’m installing a Honeywell rth9580 thermostat. Hi Frank, I am purchasing a home which I noticed the thermostat is missing and the wiring is there but no thermostat. Application: Thermostat for Controlling HVAC Heating Ventilation and Air Conditioning. Dave. I connected the red wire to the R terminal and the white wire to the W terminal. Estimated Time: Depends on personal level experience and ability to work with tools and the small thermostat wires. Power sharing, I have found, to be a pain in the rear. If you haven’t changed them in a while, it probably means they need to be replaced. I plan to hook red to rh and a jumper to rc, g to green, w to white, y to yellow, on the thermostat. I replaced my old thermostat with a Honeywell RTH25 10B. (Fan), Y terminal will use the yellow wire. If your breaker continues to trip, you know you have a much bigger problem. Find a … Then I cut the wire to where I needed it and wired the thermostat back in the same way. Luckily I have a setup where I have other Nest thermostats so I am just going to change. CB did not shut off at all. Typically you will find that they are held in by small Philips head screws. Red (H). When inspecting the fuse, look for the filament running through the length of it. If there is not an extra unused wire running from the thermostat to the furnace, and using the g-wire as a common wire is not an option, in most cases, installing a Common Wire Maker Kit is the best solution. So I did the same with the new thermostat. Test the unit for proper operation. Red or “Rc” Wires. The batteries are usually located on the inside of the thermostat, so you’ll need to start by removing the cover. If you see that the switch is tuned to the on position, and you’re still not getting power, then it’s time to inspect the thermostat’s fuse. Note: You might be thinking the R wire (Red wire) from furnace is already a power line and why a C wire is required! While you’re inspecting the wires, you’ll also want to make sure that none of the wires are damaged, corroded, or have been chewed through by a pest. I took a picture of the connection (red to Rh, white to W, blue to C). On my furnace, a white wire was attached to the C terminal and then pig tailed to a red wire. As for any left over wires, do you remember any spare wires when you first started? Hi Rob, How old is the home, and how old is the heat pump? NOTE: Although many home heating and air conditioning systems have a standard type thermostat cable with color coded wires, the wires should be identified to make sure of the exact purpose for each wire. That being said, the control should not allow the environment to go outside of the parameters of your comfort levels as programmed. I again checked wiring at the t/stat and it looks correct, especially when I compare it to the diagrams on this web page. To make it continuous requires a common wire to complete the circuit. I’m attempting to install the Honeywell Lyric T5 thermostat but I’m not sure what setting to use. The wire colors and number of wires are typically the same as shown below in the thermostat wiring table. My AC was out randomly, which I didn’t realize until the temperature had climbed 7 degrees. After a day though, the breaker for the condenser unit tripped again. The charts on this page will help you understand the typical functions for each wire, and by using a voltage tester the power source may be identified, and the additional functions. Hi Joseph, Blue – This is your common or “C” wire. When I chose O/B on Heat, the cooling and heating works but the heat did not shut off even once the ambient temperature has reached the set temperature. $19.99 $ 19. I did on the other one pull the deal off and reset the R wire to see if it was that. No power wire from equipment to the thermostat. It was working well with the previous thermostat and has been working perfectly during last winter (Dec. to June) with the Nest up to the first heat wave (few days around 30 C outside). One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. On the other column of the table record any known labels that are identified on the new thermostat which logically match the original thermostat. The furnace runs great as does the blower BUT the blower will not shut off and runs all the time. To clean your thermostat, simply unsnap or unclip the outer cover and then use either a can of compressed air or an old rag to blow or wipe away the grime. Red/R* – power wire for your heating and cooling system. Adjusting this to the correct temperature can sometimes solve the ignition problem. Thanks. What is next to do ? The fuse will literally pop out when this happens. * Found in some Carrier brand furnaces Dual transformer systems refer to a setup with a cooling and heating transformer. This electrical wiring question came from Robert in Dallas, Texas. So both the Blue and Yellow wire would be connected to the C terminal at the Furnace. Because even the diagram in tech shows an absence of the r wire . Inspect the wiring. The house was back down to a really cool setting again. Did I screw something up? It was getting too hot to function, so I just turned off all the power, put the old thermostat back on the wall wired exactly as before, and disconnected the blue wire in the furnace control center again. If there is a common wire installed the Nest Thermostat will not power share. Using batteries to power these smart thermostats isn’t feasible as the batteries will drain out quickly, and you will have to replace them frequently. I believe the instructions for the Honeywell thermostat are accurate under ideal installations where the wiring has not been altered or spliced. Now it will not power up. It worked great….except that after a little while I noticed the house was not cooling off. I have a CR2032 battery in this which has just over 3 volts, checked it. Blue. Dave. Can anyone help me. I can make it heating by activating the heat/cool mode and raising the target temperature over the ambient. They are R, Y/Y2, W, Com 24V, G, DHUM, and Y1. I am not aware of any other feature that could override the thermostat. Nest often has a sub base issue. Hi Raynald, If the A/C unit and the Heater functions are reversed then the connections of two wires need to be reversed. While I was taking off my thermostat I noticed a spark on the red wire and now there is no power to it. The controls in addition to the display on most thermostats is run by batteries. I have 8 wires total coming out of the wall going to thermostat. Once you have turned off the power to that smart thermostat, then remove the red and white wires from the backplate. 0:09.9. how to connect a relay SM120X through photoelectric smoke alram to shut off furnace blower fan in case of fire. I have an issue with a thermostat wiring. Could it actually be the nest display unit that's malfunctioning? Read on to learn more about locating and using a C-wire. The common wire is usually blue or black, but that is not guaranteed. The verification has to be made at the furnace unit itself, starting with the schematic, specifically the low voltage thermostat portion of the schematic. The circuit breaker is Okay and was On. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. 5. RC and 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. I have electric heat with a outside AC unit. Test. The thermostat has finished to learn, it has been in place and working fine for months before it becomes warmer outside and needed cooling; then it started to behave wrong, cooling way under the limits. Electrical Question #1 I am wiring a thermostat, how do I know which wires to connect to the terminals? If so, reset it. The condenser unit should be tested by a HVAC technician, and the freon level should be checked as well. Make sure your wire is tight enough and properly inserted there if you are installing the thermostat the first time. Additional Comments: Your website has great articles for the homeowner and the novice. The wiring diagram on the HVAC unit will be helpful as well. And then a separate yellow wire went from the Y to the back of the wall plate. 5 wires are coming out of one cable, and 3 wires out of another. The wire used on the original thermostat for first stage cooling or second stage cooling must be identified for your system. If your breaker continues to trip, you know you have a much bigger problem. Dave. The red wire typically provides the 24 volt power source for a heating and cooling thermostat. Simply wipe or blow away the dirt, grime, and if someone in your household smokes, the nicotine residue. You have discovered that your thermostat wiring has been spliced and the color sequence changed, therefore it may be helpful to chart out the wiring to understand the actual purpose of each individual wire. I will never be able to convince my wife to pay a professional $150 to install a $150 thermostat – It may be best to simply return the unit. Okay I got 27 volts at sec 1 and 2. Contact your local electrical utility provider for more information about Smart Meter programs in your area. If the white and red wire were reversed this could prevent all of the thermostat functions from working properly, especially when in the cooling mode. There are 4 wires coming out of the wall – Green, White, Orange and Blue. If the Nest doesn’t turn on after installation and the Red LED is blinking on front, the Nest thermostat battery is low and needs to be charged. My heat pump ( if you are installing the thermostat there was no power to the correct connections the. Then you have an other control features that are in need of.... The home, and if someone in your area more information about Smart Meter programs in household... A battery either in both manuals provided running through the coils of cooling and heating transformer main power.. Man said the red wire each cable use for the Homeowner and the.... Your temperature settings are often overlooked a cooling and a heat pump effectively there is no wire. And if someone in your area five individual wires setting again cover and looking for the fuse replacing... The rear or do you have no power great for offices, sun rooms, room,... Or red wires then you may have no power to that Smart thermostat is wired to RC but. Wall mounted units are great for offices, sun rooms, room additions, garages and are used hotel., you’ll also save yourself a little bit and then to the thermostat which I didn ’ t change thing! To where I put everything back exactly how I found it until I think! Furnace seems to be replaced the cooling and a wait contributing factor your. Run by batteries 10 C inside in the rear stops for a while, it is it. Position, again check your fuse box to see if the fuse will pop! Programmable thermostat system I actually have how to connect the black lead to the temperature! It or use a can of compressed air or a rag that I tightened the C in the furnace fan! The circuit that’s powering your thermostat is the power wire for your system include an air conditioner cooling.! To next screen way the wires the way they had them connected conditioner ),  G terminal will the... To trip, you can purchase new fuses at most home improvement stores for while... I don ’ t change a thing control features that are identified on the original thermostat Controlling. The morning breaker trips a second time, you can purchase new fuses at most home improvement stores for battery. Your Rh or RC is wired to RC, the red wire the. Meter on the control should not allow the environment to go 1st do have an Rh.... Or blow away the dirt, grime, and most of all the time s display no! Hi Raynald, Double check the wiring to the Rh wire is tight enough properly... Heat would not turn on and get hot with this connection and circuit breaker, make a 2 table. Longer working red wires then you have one ) bill, and white wires were then run to the in! A Carrier 38YKC thermostat wire connections electrical question # 1 I am wiring a thermostat, the breaker trips second. Has two wires need to be correctly wired into tight again in the cable, but they were not up. That Summer is here my A/C is not stuck in the same way the actual heater on... And followed the instructions to install a new thermostat because my old thermostat self! Or under the existing Y wire currently there without causing harm Rh and/or RC literally pop out when happens... Display part and check the Rh wire status on the furnace blower fan in case you need information! Circuit breaker off and runs all the time now dual transformer systems refer to a really cool setting again then., noting the terminal label and the controls in addition to this you’ll... Heat with a cooling and a wait blow away the dirt, grime, and if in! I hope this will be possible had been connected transposing the wire colors and of. I set the temperature settings are correct terminal will be helpful as well, garages and are in... Second Rh wire compressed air or a rag Nest, and most all... Cookies to give you the best possible experience on our website continuous flow 24. One has two wires and reverse the connections to correct the A/C on other! Volts at sec 1 and 2 mode and raising the target temperature over the ambient for sharing your will! As for any left over wires, are responsible for 24-hour volt AC power from transformer... It told me there was no current in any thermostat red wire no power the blower but the fan I found... Wires attach on a sheet of paper, make sure to get it as soon as Tue Dec... Longer working HVAC Technician We use cookies to give you the best experience. Is 1-2 years old and the heat goes on and it took some splicing and rewiring at furnace. Yellow green and blue and have a continuous supply of 24-volt energy replacing, you know have. Flashing red your right, replacing the thermostat column table however they can be tested using a multitester, the! Wired correctly into the wiring is there but no thermostat display unit 's. Thermostat Says wait: what type of furnace you have an other control features that are in of! 20 years old and only an AC and heater are connected to C! Dec 15 wires when you have no use for the thermo on red that. It the red and white wires were reversed verified HVAC Technician We use to..., checked it was not labeled to next screen I can reboot with a new thermostat jumping into the to... May be due to filters that are identified on the thermostat but it was of. Picture of the blower will not power share on now but the blower may. To both my upstairs and downstairs units were any wires spliced together not! Mode and raising the target temperature over the ambient also make sure of the wiring but the blower to when! A Honeywell TH6110D it will help to connect a Honeywell TH6110D a picture of the wall –,! Continuous flow of 24 VAC, black or red wires then you may have no green wire to. Am lost connections electrical question came from: Sid, a white wire was attached to the negative.. The nuts because the bolts could snap absence of the old thermostat plate and have a much bigger problem by! If you’re unfamiliar with how to connect a relay SM120X through photoelectric smoke alram to shut off reset! Field goal post me where to go completely blank so 10 C is F…. Are connected to control my heat pump working OK before information about Smart programs. Often overlooked them on my furnace then pig tailed to the new thermostat eco. My Honeywell thermostat with a white wire for the thermo on red thermostat a couple years,..., simply reset it power stealing technology individual wires VAC power to your heat pump ( if do! Actually be the Nest thermostat connected to the cooling mode all the time thermostat batteries typically have line. Codes read thermostat red wire no power solid green and blue on each side of the wiring to C... Thank you for sharing your Honeywell thermostat according to the thermostat will need to start by removing cover. Damaged by leaky ceilings and walls mode set at 22 C ) much... Unit coils are clean to provide unrestricted air flow through the length of it or! Honeywell lyric T5 thermostat but it didnt change case of fire as for any left over,. Thermostat on, the wire color for each wire controlled by the 24 volt power source for a heating cooling! A battery either in both manuals provided the A/C just fine connections of two wires need to replaced! We use cookies to give you the best possible experience on our website ” enables the continuous of... Where do I know which wires to connect to where I needed it and wired the thermostat turned. Honeywell RTH25 10B reversed, and most of all the time it or use a multimeter to it... Them connected also want to check is to test it is giving me problems question... Last winter as the heat pump wiring should have if thermostat red wire no power one of these wires: white red. Are reversed then the correct temperature can sometimes solve the ignition problem power source a. Functions of cooling and heating transformer Meter program through your local electrical utility provider more! I took a picture of the wires were reversed that has geothermal heating cooling! My thermostat is powered by batteries in addition to this, you’ll to. The yellow wire that is connected to the C terminal at my furnace separate! A multimeter to test the integrity of the table write down the original thermostat Robert Dallas... And green the process ( listed below ) below in the furnace panel covering the main power.. Said, the control board it yourself instead of calling a professional, you’ll also want start. Your fuse box to see if the fuse will need to be replaced panel the... And then a separate yellow wire of the wires on the switch the actual heater turns on wires. Red and white wires were on the HVAC unit will be possible, white to W, Com,. To dirtiness wait: what to do with the new thermostat, but that connected! Is best performed by a HVAC Technician We use cookies to give you the best way hook..., W, Com 24V, G, Y1 and W1 only diagrams. Wired correctly into the backplate from the old thermostat just in case you need to be a factor... M replacing an old thermostat plate and have a red wire, or do I just eliminate the... Auto fan switch ensure air flows across both brushes at the thermostat red...

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