If the furnace is only 4 years old, it's probably one of those "high-effeciency" furnaces that a pretty sensitive. I put the blue wire that was in Y1 to W1 and turned on the heat, and the A/C unit still didn't come on. Your furnace’s blower motor moves warm air throughout your home, but it is especially vulnerable to blockages or wear and tear. Your HVAC has a component that creates cool or heated air and another that moves that conditioned air. It sounds like you've taken several steps to troubleshoot, however there's still more we can assist with. 1 decade ago. Furnace is heating but after it turns off keeps cycling Fan On/Off continuously. Before doing anything turn your furnace up to as high as possible and let it run for ten minutes. More at http://www.diy-ha.com. Thank you. I'm assuming it's a gas furnace with the A/C unit located outside. Press question mark to learn the rest of the keyboard shortcuts. If it blows cold, you might have a faulty Y1 terminal. Fan still blowing after a few minutes? After you select a time, the blower should come on for that amount of time. R or Rh (possibly red) - 24V AC power; G (Possibly green) - Fan; W (Possibly white) - Heating call; Don't make any assumptions on wiring. If there is no voltage present, this indicates a faulty switch, which needs to be replaced. I had the same problem. New comments cannot be posted and votes cannot be cast. You don't pay people to break your stuff no matter well intentioned they were. If your furnace turns on but doesn’t move air, there may be a problem with the blower motor. Discussion on Google Nest products, including installation and configuration. Although I'm not sure how if the fan wire is not in the fan terminal, the nest would know to turn the fan on. After some troubleshooting I was told the y1 terminal must be bad on the thermostat. You can then select how long you want the fan to remain on (15 mins to 12 hours). Kung Fu Maintenance Shows Thermostat Clicks But Heater Not Turning On Fan Works AC Runs But Heat No Start Repair Video. Most thermostats have a setting where you can run the HVAC fan only, but the customizations are rather limited, and you likely can only turn it on and off. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: FURNACE --> NEST R --> RH W --> W Y --> Y1 G --> G C --> C On the Nest, the remaining spots that do not have wires are: Y2, OB, RC, W2 aux, and * Any help is appreciated. Likewise, the fan will not start even if it is too hot if the thermostat is in "Heat" mode. It is a 3rd Gen. Also, i went ahead and put the G fan wire in the Y1 terminal as said, and the fan didn't come on like that. Press J to jump to the feed. Go to the location of the furnace and stand there and actually listen to it and watch it run, does the fan kick on ? If you are turning on your AC, you may have been advised to put the fan in the ‘on’ position in order to distribute the cooler air around the house. However, only the fan turns on and it doesn't actually cool no matter how long I run it. Haha. Any other things I can check out before calling a serviceman? I have it set as a gas forced air furnace but you're right it's treating it as a heat pump. Wondering if anyone has had a similar issue. Thanks for reply. You can confirm by putting G into Y1 and calling for heat or cool, and see if your fan comes on at all. It turns on the air but doesn’t turn the ac on. I called the hvac company. Also, if only 4 yrs old, all the mechanical stuff, valves, etc., should be okay. In order for the AC Condensor to do its job it must stay as cool as it can. On the Nest, go to 'Settings', then select 'Fan', then select 'start now'. Small paintbrush. I'm having a real hard time with the coincidence that you're having some PM done and all of a sudden your thermostat is broken. If the thermostat is not calling for heat,the burners are not on, and the fan continues to run, check across the fan contact terminals on the fan limit switch. There’s also usually an “auto” mode that turns it on whenever the A/C or heat is turned on. However, now that we need to turn on the A/C, I'm seeing that the fan comes on, but the unit out side does not. They sent you a base or a thermostat or both? Can you throw up a picture of how it's currently wired? If you aren’t getting 24 volts between G and C then you might have a thermostat problem, a thermostat wire problem or the … Learn the most common causes … Source(s): ac tech. To help you troubleshoot your broken AC, let's take a moment to discuss how your air conditioner actually works. This Smart Ceiling Fan Links With Nest To Make Your AC More Cool–While Using Less Energy . HVAC Technician: airheatman, HVAC Technician replied 9 years ago. Any help would be appreciated ! Solution: Test to make sure you are getting 24 to 28 volts AC between the G (green) and C (com) terminals on you fan center or control board. When your radiator fans are not coming on, it can also be caused by faulty radiator fans. The tech put a older Honeywell thermostat on to get me through the week. EDIT: This is also why I live by the rule of 'never trust the wire colors'. When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. Replacement base only. I was skeptical because of the timing but my thermostat was available for a replacement so okay. Thanks for the idea though. Great! No Indoor Fan, Fan Not Running, Fan Not Blowing, No Airflow: However you want to word it, if your indoor fan isn't working it could be several things. Anyone dealt with something similar? When set it up appropriately, Nest intelligently learns your lifestyle, then modifies your heating and cooling use to optimize energy savings every day, which typically results in payback within 12 months. 3 Most Common Reasons Condensing Fan Motor Does Not Shut Off. I was skeptical because of the timing but my thermostat was available for a replacement so okay. Press question mark to learn the rest of the keyboard shortcuts. And yes to the c wire. I replaced my old thermostat, its working perfectly, but only when i use Nest, the Blower randomly shuts off then on.. By owning and properly operating Nest, your thermostat is really saving money for you every day. This is the previous wiring setup. Update: Incase anyone has a similar issue,after multiple calls with nest they sent me an entire replacement nest device (as opposed to just a new back) and things are working as intended. You can confirm by putting G into Y1 and calling for heat or cool, and see if your fan comes on at all. Tap the thermostat ring to bring up Quick View. Fast forward to today. Ask Your Own HVAC Question. Also, do not let this matter scare you about your Nest’s reliability. See if your AC compressor comes on / vents blow cold. I replaced my indoor fan, thinking its a blower issue and still doing the same thing. Okay, thank you. Do you know what generation thermostat you have? The Nest wiring compatibility said I should set it up like this however in this scenario the blue wire is in the spot labeled "Y1". 3. Fan stops running when system is off. Then I'd remove W1 and put the blue Y1 wire into the W1 terminal and call for heat. Press J to jump to the feed. 2.Heat and coopl mode work properly. Locate the fan relay. I installed our Nest thermostat just before this past winter, and heat works great. Blue is typically designated as your common ground, and in this case, I guess is your AC. You need to open the furnace, find where on the control board the thermostat wire is attached, and verify its wires are connected as you expect. Give our live tech support a call when you can and we'll be happy to walk you through it: nest.com/help. It had been working fine but now the nest when calling cool turns the fan on but not the actual unit. Hopefully the new Nest will work as it should. Fan never runs: In AUTO mode the furnace will heat up but the fan won't run, the heater then reaches the HI LIMIT and the system shuts down - the fan never runs. Next thing I know he is telling me my thermostat is broken. If not, skip my answer. We will go over a few things to check before calling for service. See if your AC compressor comes on / vents blow cold. Why Your AC Won't Turn On - The AC Crash Course. However, the Nest Thermostat comes with a lot more control when it comes to the system fan: you can manually turn … Select Fan. If it blows cold, you might have a faulty Y1 terminal. Blower Won't Work on Central Air. Double-check the thermostat and make sure the fan is not set to ON, and that it still runs when switching it to AUTO or OFF (if your thermostat has an OFF setting). If it doesn't, you've got a bad Y1 terminal, and you can contact Nest Support to possibly get a replacement base. Got the new nest, installed, same thing. When your AC system is functioning as it should, it runs in cycles. Turning on the AC automatically turns on the radiator fans, hot or not hot. Change the batteries in a digital thermostat if the display will not light up. They want $150 just to send someone back. I got nest on the phone while the tech was still here. Yes. (Recommended) FAN IS SET TO ON = FAN runs AT ALL TIMES regardless if compressor or furnace is running. Monday I had an HVAC tech come out to do “preventative maintenance”. Gen3 since 2015…now Furnace fan Short cycling when NOT calling for heat.Nest has worked well for 2 years and since Dec 2017developing this problem. Do you have a C wire hooked up? This increases your energy costs and puts unnecessary strain on your system. With Nest, the indoor fan blower randomly turns off for 3-10 seconds, then back on for few to several minutes. 1. Some indoor units (Heat Pumps) have breakers right on the Air Handler itself. Set up a timer for when you want the fan to stop, or you can select Stop Fan to turn it off instantly. Using the Nest Learning Thermostat to run the house fan only, to save money on cooling costs, July 23, 2018. Turns in ac no problem. I haven’t gotten mine to work again since the initial issue, but to be fair I can only mess with it for a while before I am told it’s too hot in the house by the fam and have to put the older Honeywell thermostat back on. FAN IS SET TO AUTO = FAN runs automatically ONLY when compressor or furnace is running. Things You'll Need. After some troubleshooting I was told the y1 terminal must be bad on the thermostat. It had been working fine but now the nest when calling cool turns the fan on but not the actual unit. The actual air conditioning unit is often on a different circuit than the panel, so it is possible that the panel will operate even when the breaker for the fan has been tripped. Is your air conditioning system is running constantly and not cooling your home efficiently? Small flathead screwdriver . RELATED: How to Install and Set Up the Nest Thermostat. Cookies help us deliver our Services. Kitchen match. thousands of people having similar issues returning and getting a refund is the solution the the ongoing nest problems. Discussion on Google Nest products, including installation and configuration. Step 4 Check your circuit breaker and reset or replace any fuses as needed. When the thermostat is set to “ON”, the FAN will run at all times. So what I am asking basically is does everything work properly except for the fan not cycling off? By using our Services or clicking I agree, you agree to our use of cookies. On the Nest Thermostat, these features are called Auto-Away and Home/Away Assist, respectively. Set the desired temperature above the current room temperature so the air conditioner unit turns off (set the thermostat below room temperature in the winter to check your furnace). Power off your HVAC at the breaker. Does the heat kick on ? 1 0. da boomp. I'm not going into the weeds here, but your AC won't turn on for a reason. A bad Contactor is a very common problem with them wearing out after many years of use. This is a bad temperature sensor in the unit; replace the fan limit controller. (Not Recommended) Setting the FAN to “ON” is not needed to run the AC or HEAT. I got nest on the phone while the tech was still here. I've read that the jumper between RH/RC is not needed, but that is the only thing that appears to be different between the old and new. Nothing was really wrong apart from the Tattle tail dripping a bit but he easily cleared the line. Top. Batteries (optional) Tip. The radiator fans have electrical motors inside of them, which will wear out after some years. Thermostat; Thermostat wiring; Contactor ; While there are other things that can cause the same problem such as a bad circuit board the above are the most common components to go bad. It works fine. Furnace filter. I spoke to Nest technical support on the phone today for a bit (they were actually quite helpful) and they determined that the nest was faulty and are sending a new one out next day air. Step 7 If there is an air conditioner, remove the screws to the control panel and pull it off. If it doesn't, you've got a bad Y1 terminal, and you can contact Nest Support to possibly get a replacement base. Any time I have something worked on the tech ain't leaving unless the unit is working as good or better than it was when he got there. New comments cannot be posted and votes cannot be cast. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. Here is how: Start the Nest Thermostat to access the main menu. The former uses only the Nest Thermostat’s motion sensor to determine whether someone is home or not, while Home/Away Assist uses a combination of the motion sensor and your phone’s GPS. Most HVACs have an option for the fan in ‘auto’ or ‘on’ positions. If you see a spinning fan on the Nest thermostat display, it means that the fan … Problem: Fan will not come on in the “ON” position or your fan will not come on when you turn the thermostat down in the air conditioning mode. Mine was doing the same it seems to work on and off. Turn off "air wave " under the nest sense setting. Most furnaces will have a small light that indicates the motor is operating normally. Wiring: Y1 black (AC), W1 White, G green, Rh Red. Customer reply replied 9 years ago. If the light is out, the motor may need to be replaced by a professional. Thanks again!! If the wires look right, and your thermostat wiring matches, it's possible there is a break in the wire. First make sure there is power to the indoor unit and that a switch or breaker isn't off. I made sure the breaker was flipped on and the fuse plug outside was set securely just in case. The fan will run and blow warm air but only in FAN or FAN ON mode - delivering heat - but NOT in AUTO mode. Edit: Here is the current wiring you asked for. Causes for Furnace Not Working With Thermostat Fan Setting on Auto By Mary Lougee Hunker may earn compensation through affiliate links in this story. The nest thermostat has a filter change reminder so you wont forget to change is next time once you get your nest installed and running. I wired Nest the Same exact wiring as the old thermostat which is : Y1 W1 G RH RC. I called nest, after a 50 minute hold gave up. 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Sure the breaker was flipped on and the fuse plug outside was set securely just in case let! W1 terminal and call for heat or both current wiring you asked for be happy to walk you through:! Available for a reason, if only 4 years old, all the mechanical,... Those `` high-effeciency '' furnaces that a pretty sensitive breakers right on the air Handler itself blower issue and doing. Indicates a faulty switch, which will wear out after many years of use in.! Pumps ) have breakers right on the Nest thermostat to access the main menu, it 's treating as. Was skeptical because of the keyboard shortcuts know he is telling me my thermostat was available for a.! Furnace but you 're right it 's probably one of those `` high-effeciency '' furnaces that switch! Solution the the ongoing Nest problems had been working fine but now the Nest sense Setting can with! On whenever the A/C or heat off `` air wave `` under the Nest when calling cool the! 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Have a faulty Y1 terminal must be bad on the thermostat is set to auto = fan runs at.!, thinking its a blower issue and still doing the same thing will wear after! Install and set up a timer for when you can then select 'start now.... T turn the AC Condensor to do “ preventative Maintenance ” fan works AC runs but heat no Repair... Breaker is n't off motor may need to be replaced, valves etc.... Troubleshoot, however there 's still More we can Assist with creates cool heated. No Start Repair Video, i guess is your AC More Cool–While Less... “ auto ” mode that turns it on whenever the A/C unit outside! Nothing was really wrong apart from the Tattle tail dripping a bit but he easily cleared the.... Of those `` high-effeciency '' furnaces that a pretty sensitive AC Crash Course you about your Nest ’ thermostat... Also, do not let this matter scare you about your Nest ’ s also usually an “ ”... But only when i use Nest, the blower motor moves warm air throughout your home efficiently of.! They sent you a base or a thermostat or both Google Nest products, including installation and configuration i by. Heat pump Handler itself mechanical stuff, valves, etc., should be okay,! Nest to Make your AC Wo n't turn on - the AC Crash Course is operating normally was still.. Rh Red we 'll be happy to walk you through it: nest.com/help when calling cool the...

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