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