I'll try and summarize as much as I can: I installed 3rd Gen thermostat over a month ago, realized couldn't get heat working, but AC worked fine... messed around with things for a while then gave up. Old thermostat: Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. On a miserably hot and humid summer day, the last thing you want to deal with is a heat pump that is blowing out hot air. The fan just blows regular temperature air that doesn't appear to be heated or cooled. The only time it does not blow hot air is when I turn the air off and only use the fan. My thermostat keeps showing auxiliary heat and it blows cold air. Check The Thermostat. While the Google Nest Thermostat install can be fairly simple on most systems, there are occasions where something goes wrong. Thermostat calls for heat and turns on fan simultaneously. Perhaps your temperature gauge is running below normal. trying to install nest thermostat, have a goodman furnace. If your fan works, but you still have cold air, check to see if you get warm air when the thermostat is set to EMERGENCY HEAT, which is at least five degrees above room temp. If you see steam coming out of your outdoor coil that is a normal operating procedure for a heat pump system, so don't be alarmed. The customer service rep continually lied to me about having a tech to come out to replace the wire in my system ( he stated that nest … We use cookies to give you the best possible experience on our website. What to do if your heat pump is blowing cold air. 83% Upvoted. By continuing to use this site you consent to the use of cookies on your device as described in … Thermostat problems: First of all, check to see if your programmable thermostat is set to have the heat come on at the right time. For those who don’t want to bother doing all the checks necessary to find the problem, simply call an HVAC specialist out to determine why the air coming from the heater is cold. Bam. Contact Support at 1-855-733-5465 to find a pro-installer in your area. Maybe the fan is malfunctioning. To find out if your heat pump is actually blowing cold air , hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). with the nest the air feels cooler, almost as if the a/c is set to 68. has anyone else experienced this? Bottom line: Don't panic if you have a heat pump and if cold air blows out of your duct work for a little while on and off while you run your heat at home. You can do this by following the steps given below. Thermostat … Nest thermostat turns ON AC instead of heat. 6 … Make sure that your thermostat is set to HEAT. If cold air is seeping into your ductwork, it must blow out of the duct registers before the furnace’s warm air can—thus it feels like air-conditioned air is ventilated through your home despite the thermostat being set to heat at 72-degrees. I used to be able to turn it on full blast/max AC and let it run for like 5 mins or so and then turn it back to heat and it would work. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. Here is the old thermostat wiring: Original Thermostat Wiring This wiring was copied to the Nest: Nest … trying to install nest thermostat, have a goodman furnace. There are many reasons your car's heater isn't working. There are plenty of things you can try on your own at home to correct a thermostat that clicks but gives off no heat or air. 1 Recommended Answer 5 Replies 5 Upvotes My Nest is set ... To isolate the issue, I'd suggest removing the display of your Nest thermostat while the fan is running but not calling for heat/cooling. 3 comments. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. 2. When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. no heat at idle. If you have a Nest learning thermostat that blows cool air when it’s set in heating mode, you have to adjust the settings of the O/B wire orientation of the heat pump. After installing the Nest, during the heat pump test, my system blows warm air just fine.BUT, for the aux heat test, the air is not warm, and feels like room temp or slightly colder.. I installed a new RTH9585 over the summer, our old Robert Shaw stopped working. As long as that’s happening, everything’s hunky-dory. The other morning it was 2 degrees F and the HP was quietly working in HP mode providing warm air at the registers. Just not hot.I have contacted Honeywell support via … Q: As usual when the engine heats up after driving for a while hot air starts coming through. AUTO ensures that the blower will run only when the furnace heats the air. While the Nest Learning Thermostat continues to be a popular choice, ... which caused cold air to blow when the heat was set to on, and hot air when the thermostat was set to cool. If everything seems correct, the problem might be a miscalibration that’s causing your thermostat to read the temperature incorrectly or an electrical problem that’s stopping the thermostat from communicating with the heat pump. If these DIY approaches are unsuccessful, it may be time to call in an experienced HVAC technician. COLD – This means your thermostat is cooling correctly, but the heating isn't working properly. New thermostat worked flawless with the A.C. and I never tested the heat mode until now that is getting cold. Check your thermostat and make sure that it is set to “auto” rather than “on.” When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. While this may seem like an issue, your heat pump can usually heat your home just fine, but when it’s extremely cold out (below 30 degrees), it just takes your system a little longer to do so. Before you dial your air conditioner service, take a pause.You may be able to handle the issue yourself… save hide report. There are a few reasons your heat pump could be blowing cold air. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 It blows coolish air but it doesn't seem like it's cold enough and it seems to be stuck reading the indoor temp between 75-79 when I feel like it's a bit cooler than that. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. If you don’t feel warm air, you may have a defective thermostat or air handler. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. If you feel warm air, then you need a technician to check the outdoor unit. We’re going … I would never have come up with the idea of pulling heat from cold air. Nest Thermostat not blowing cold air - Answered by a verified HVAC Technician. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. 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. Nest 3rd Gen Thermostat. 6 … its not the thermostat because it stays at operating temp the entire time. Make sure the vents in that area haven’t accidentally been closed, particularly if some rooms are getting no air at all. We outline the costly mistakes you could make installing your nest thermostat and why it is worth every penny to hire a nest … share. It continues to blow when it's in auxiliary also but w/o heat just air. After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. When I make a stop like in traffic then it starts to blow cold air My car has 197000 miles. I followed the instructions to the tee, took pictures and went back an rechecked my work. The fan now just turns on first and blows cold air for about 30 sec or more before it heats up. And then your heat pump should shut off. However, if I turned the temperature of the heat down, it would go back to blowing cool air. And you wait — and wait — but the heater just blows cold air. Your furnace may be blowing cold air because the filter is too dirty. If your thermostat is battery-powered, replace the batteries. Spent over two hours on the phone with customer support with no resolve. We have a forced air system, all wires from old were matched to the new one. Check the furnace’s air filter. It blows air gently at body temperature and it works down to 0 degree F (and maybe below) in heat pump mode. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. My heat stopped blowing hot ( only blows cold air). My car has an automatic transmission. AC Blows AC, Heat Blows AC. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. Don't panic if you see frost on your outside equipment's coil. Heat only works while driving. Two Reasons Your Heat Pump Is Blowing Cold Air. AC works great, and when put in heat mode it still blows cold. My 2015 Nissan Rogue blows cold air. WARM/HOT – This means your reversing valve may not be configured or wired properly. Otherwise your electric heater or gas furnace will not turn on. Noticed the fan blowing for a while before the gas heat kicked in. Ensure that your thermostat is set higher than the temperature in your home. One of the most common causes of a furnace blowing cold air is not actually a repair at all. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. There could even be a puddle of liquid under the front of the vehicle. I have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. This problem could be mainly because of the wrong wiring connection. Many may have a cold air problem with their heating unit, and this could be for several reasons that can only be determined by doing some checks on the system as well as the thermostat. While this may sound silly, this switch can sometimes get moved when dusting around the area. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. Nest Thermostat isn't blowing cold air. What is lurking behind the walls in your home could cost you thousands of dollars if your not careful while installing your nest thermostat. Air is flowing strong, furnace fan is working. 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. Update amazon now offers a free smart home consultation After two not helpful calls with Honeywell, I have the unit set on Cooling and it is blowing hot air. A lack of heat can be a symptom of a much larger problem. Most of these tasks take just a matter of minutes, but they could save you hundreds of dollars in repair bills. This is really amazing technology! i know 68 degrees is 68 degrees is 68 degrees, but with my old thermostat if i set the heat to 68, the vents blew air that felt warm. My Nest is set to HEAT only and yet blows COLD air when set to a lower temperature than in house. A.C. and I never tested the heat down, it would go back to Cool. 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