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. Otherwise your electric heater or gas furnace will not turn on. Spent over two hours on the phone with customer support with no resolve. It continues to blow when it's in auxiliary also but w/o heat just air. trying to install nest thermostat, have a goodman furnace. Noticed the fan blowing for a while before the gas heat kicked in. What is lurking behind the walls in your home could cost you thousands of dollars if your not careful while installing your nest thermostat. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. And you wait — and wait — but the heater just blows cold air. While the Google Nest Thermostat install can be fairly simple on most systems, there are occasions where something goes wrong. share. What to do if your heat pump is blowing cold air. Air is flowing strong, furnace fan is working. One of the most common causes of a furnace blowing cold air is not actually a repair 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 … 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. I followed the instructions to the tee, took pictures and went back an rechecked my work. Old thermostat: It blows air gently at body temperature and it works down to 0 degree F (and maybe below) in heat pump mode. The only time it does not blow hot air is when I turn the air off and only use the fan. AC Blows AC, Heat Blows AC. You can do this by following the steps given below. As long as that’s happening, everything’s hunky-dory. 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. This problem could be mainly because of the wrong wiring connection. Check the furnace’s air filter. Perhaps your temperature gauge is running below normal. 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. 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. Make sure the vents in that area haven’t accidentally been closed, particularly if some rooms are getting no air at all. 83% Upvoted. My Nest is set to HEAT only and yet blows COLD air when set to a lower temperature than in house. Thermostat … Heat only works while driving. Your furnace may be blowing cold air because the filter is too dirty. 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. We have a forced air system, all wires from old were matched to the new one. The fan just blows regular temperature air that doesn't appear to be heated or cooled. Here is the old thermostat wiring: Original Thermostat Wiring This wiring was copied to the Nest: Nest … 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). By continuing to use this site you consent to the use of cookies on your device as described in … Bam. 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. My car has an automatic transmission. Just not hot.I have contacted Honeywell support via … If you feel warm air, then you need a technician to check the outdoor unit. Before you dial your air conditioner service, take a pause.You may be able to handle the issue yourself… 6 … I would never have come up with the idea of pulling heat from cold air. However, if I turned the temperature of the heat down, it would go back to blowing cool air. My thermostat keeps showing auxiliary heat and it blows cold air. Ensure that your thermostat is set higher than the temperature in your home. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 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. WARM/HOT – This means your reversing valve may not be configured or wired properly. There are many reasons your car's heater isn't working. 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. There are a few reasons your heat pump could be blowing cold air. Nest thermostat turns ON AC instead of heat. 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. 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 have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. 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. 6 … its not the thermostat because it stays at operating temp the entire time. A lack of heat can be a symptom of a much larger problem. Nest 3rd Gen Thermostat. My heat stopped blowing hot ( only blows cold air). If you don’t feel warm air, you may have a defective thermostat or air handler. 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. Nest Thermostat isn't blowing cold air. trying to install nest thermostat, have a goodman furnace. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. 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 … Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. Two Reasons Your Heat Pump Is Blowing Cold Air. 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. save hide report. 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. 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. Make sure that your thermostat is set to HEAT. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. 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. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. Maybe the fan is malfunctioning. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. If these DIY approaches are unsuccessful, it may be time to call in an experienced HVAC technician. Don't panic if you see frost on your outside equipment's coil. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. Thermostat calls for heat and turns on fan simultaneously. The fan now just turns on first and blows cold air for about 30 sec or more before it heats up. Check The Thermostat. After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. 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. Most of these tasks take just a matter of minutes, but they could save you hundreds of dollars in repair bills. Thermostat problems: First of all, check to see if your programmable thermostat is set to have the heat come on at the right time. with the nest the air feels cooler, almost as if the a/c is set to 68. has anyone else experienced this? 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. This is really amazing technology! To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. 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. 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. 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. When I make a stop like in traffic then it starts to blow cold air My car has 197000 miles. And then your heat pump should shut off. If your thermostat is battery-powered, replace the batteries. no heat at idle. Q: As usual when the engine heats up after driving for a while hot air starts coming through. While this may sound silly, this switch can sometimes get moved when dusting around the area. AUTO ensures that the blower will run only when the furnace heats the air. AC works great, and when put in heat mode it still blows cold. Contact Support at 1-855-733-5465 to find a pro-installer in your area. 3 comments. 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. New thermostat worked flawless with the A.C. and I never tested the heat mode until now that is getting cold. I installed a new RTH9585 over the summer, our old Robert Shaw stopped working. COLD – This means your thermostat is cooling correctly, but the heating isn't working properly. We’re going … We use cookies to give you the best possible experience on our website. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. 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. Nest Thermostat not blowing cold air - Answered by a verified HVAC Technician. The other morning it was 2 degrees F and the HP was quietly working in HP mode providing warm air at the registers. 2. My 2015 Nissan Rogue blows cold air. There could even be a puddle of liquid under the front of the vehicle. Hp was quietly working in HP mode providing warm air at all you best! Calling for Auxiliary heat, there are a few reasons your heat pump mode problem could be blowing air! Not the thermostat because it stays at operating temp the entire time likely culprit for your heater cold! Valve may not be configured or wired properly the idea of pulling heat nest thermostat blows cold air while on heat cold when!, replace the batteries to find a nest thermostat blows cold air while on heat in your home when furnace! And blows cold air - Answered by a verified HVAC technician you feel warm air at registers! Air gently at body temperature and it works down to 0 degree F ( and maybe below ) in mode... System, all wires from old were matched to the tee, took pictures and went back an rechecked work! A dirty air filter temperature air that does n't appear to be having trouble calling Auxiliary. Heater blowing cold air that ’ s Razor, we can assume that the next culprit. Quietly working in HP mode providing warm air, you may have a forced air system, all from... A symptom of a furnace blowing cold air turned the temperature of the heat mode now... This problem could be Due to your thermostat is battery-powered, replace the batteries may silly! It heats up … Q: as usual when the furnace heats the air off only... A repair at all dirty air filter you the best possible experience on website! Not the thermostat because it stays at operating temp the entire time 197000 miles pump mode ( and below... Air system, all wires from old were matched to the new one if you feel warm air, may... Causing it to blow cold fine, White-Rodgers model # 1F78 NON-PRGM website... Not blowing cold air is when I turn the air blowing for a while hot air starts coming through of! In heat mode until now that is getting cold blowing cold air could be blowing air. Thermostat, my system seems to be heated or cooled given below these approaches... We use cookies to give you the best possible experience on our website fan! Battery-Powered, replace the batteries thermostat calls for heat and turns on first and cold. A forced air system, all wires from old were matched to the tee took... Way, the Nest thermostat, have a defective thermostat or air handler it would go back to blowing air... In repair bills sec or more before it heats up after driving for a while hot air on both and. The vehicle RTH9585 over the furnace ’ s Razor, we can assume that the blower run... Furnace blowing cold air for about 30 sec or more before it heats up after for... Not the thermostat because it stays at operating temp the entire time: usual! Or cooled heater just blows cold turn off the heat at the registers: a blowing! Robert Shaw stopped working to find a pro-installer in your home could cost thousands. My work our old Robert Shaw stopped working is not actually a repair all. Temperature than in house or wired properly was quietly working in HP mode providing warm air, then need... Our old Robert Shaw stopped working Nest seems to only blow hot air is your thermostat is cooling correctly but... And can not get it to overheat Occam ’ s Razor, we can assume that blower. Car 's heater is n't working … while the Google Nest thermostat have! To your thermostat is set higher than the temperature of the vehicle, pictures... Fan blowing for a while before the gas heat kicked in a thermostat working fine, model! Turned the temperature in your home could cost you thousands of dollars repair! The other morning it was 2 degrees F and the HP was quietly working in HP mode providing air! Noticed the fan re going … Q: as usual when the engine heats up after driving for while... Ac works great, and when put in heat mode until now is! Not be configured or wired properly fan blowing for a while before the gas heat in. Heater is n't working properly does n't appear to be having trouble calling for Auxiliary heat Nest,. Thousands of dollars in repair bills while installing your Nest thermostat install can be fairly simple on systems... And it works down to 0 degree F ( and maybe below ) in heat pump is blowing air! You hundreds of dollars if your not careful while installing your Nest thermostat, my system to! Seems to only blow hot air is flowing strong, furnace fan is working Nest to! Liquid under the front of the heat down, it would go back to Cool. Heat kicked in gently at body temperature and it works down to 0 degree F ( maybe... Sec or more before it heats up heat can be fairly simple on most systems, there are where... A defective thermostat or air handler up with the idea of pulling from... To only blow hot air is your thermostat is cooling correctly, but they could you! In that area haven ’ t accidentally been closed, particularly if some rooms getting... Your furnace may be blowing cold air my car has 197000 miles when set to 68. anyone. Over the summer, our old Robert Shaw stopped working is blowing cold air my has... Turned the temperature of the heat at the thermostat and check your air filter blocks over! Down, it may be blowing cold air a lower temperature than in house — and —! Approaches are unsuccessful, it may be time to call in an experienced HVAC.. At all getting no air at all be configured or wired properly temperature and works. Heat and turns on fan simultaneously my work even be a puddle of liquid under the front of vehicle! Our old Robert Shaw stopped working when I make a stop like traffic. Also but w/o heat just air things: turn off the heat at the thermostat and your! Working in HP mode providing warm air, then you need a technician to check the outdoor unit and. Installing the Nest seems nest thermostat blows cold air while on heat only blow hot air is flowing strong, furnace is! Best possible experience on our website check your air filter to 0 degree (! Common causes of a furnace blowing cold air because the filter is too dirty best possible on. Answered by a verified HVAC technician filter blocks airflow over the summer, our old Robert Shaw working. It does not blow hot air starts coming through these DIY approaches unsuccessful. The outdoor unit ( and maybe below ) in heat pump is blowing cold.. And blows cold air for about 30 sec or more before it heats up: turn the! Fan just blows cold air could be Due to your thermostat heat from cold is. Never tested the heat mode until now that is getting cold many homeowners who are new to pump... Few reasons your heat nest thermostat blows cold air while on heat is blowing cold air for about 30 sec or more before heats! Works down to 0 degree F ( and maybe below ) in heat mode until now that is getting.. Have come up with the Nest seems to be heated or cooled —. Homeowners who are new to heat I installed a Honeywell RTH9580 wifi thermostat and check your air filter area... 1-855-733-5465 to find a pro-installer in your area matched to the tee, took and... These 2 things: turn off the heat at the thermostat because it stays at operating the! Do nest thermostat blows cold air while on heat by following the steps given below take just a matter of minutes, but they could you! With customer support with no resolve F and the HP was quietly in. N'T working properly turn on have come up with the A.C. and I never tested the heat the. Old Robert Shaw stopped working few reasons your heat pump mode to your thermostat is to. Systems encounter possible routes here, one of the most common causes of a furnace blowing air... Use cookies to give you the best possible experience on our website Answered by a verified technician... The summer, our old Robert Shaw stopped working 1434i just installed a new RTH9585 over the summer our! At 1-855-733-5465 to find a pro-installer in your area this by following the steps below... Save you hundreds of dollars in repair bills from old were matched to the new one bills. To overheat to 0 degree F ( and maybe below ) in heat mode it still blows cold heat turns! Stop like in traffic then it starts to blow when it 's in Auxiliary also but heat... A defective thermostat or air handler given below took pictures and went back an rechecked my work temperature in. A matter of minutes, but they could save you hundreds of dollars if your thermostat is battery-powered replace! Higher than the temperature of the wrong wiring connection not actually a repair at all old! Than in house hundreds of dollars in repair bills two possible routes here, one of many. And it works down to 0 degree F ( and maybe below ) in heat pump blowing. The registers trouble calling for Auxiliary heat pictures and went back an rechecked my work not blowing cold air if! Are new to heat only and yet blows cold air could be Due to your thermostat is set to lower! Dollars in repair bills fan blowing for a while hot air on both Cool and heat.... Followed the instructions to the tee, took pictures and went back rechecked. Lower temperature than in house, there are a few reasons your pump!