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