Hi, I have two nest controlled unit. Share this conversation. No a/c, just a goodman gas furnace blowing into house thru vents. My un... Nest Heating Only, Cooling blows warm air. Verified. Now that it's starting to warm up, the air conditioning is just blowing hot air, not cool. Thermostat for sure. If your heat pump is not blowing hot air, there are typically three main causes: Unit is blocked: Your heat pump pulls heat from the air outside into your home. I reset it again and rewired it to only have one white wire installed into the o/b slot. Both of these problems can be beyond frustrating. HVAC Guru, HVAC TECH. - Installed Replacement base and unit was still blowing warm air in cool - Called Nest again and after hours T/S again they determined my unit is operational and its possibly the actual Nest unit - Received new unit a couple weeks ago and everything seem to be operating smoothly I have cool air when calling for cooled air and vice versa for heat. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. The heater is only blowing through cool air, the fans and blowers are working fine - he's been to a specialisist (!) I've tried troubleshooting. You might also want to check your ductwork too. Before i go and call a repair man to take a look i wanted to see if any of you fine people may have a solution. Hi. Thread Starter. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. Hence the hot air. I recently went from an old AC unit, to a new Nest 3rd Gen. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. I have 2 nest, the one upstairs is connected to the heat pump. If that isn’t the problem, call a technician for help. No problems with heat or cool until this morning. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Heat Pump Thermostat Set to Cool, Blows Hot Air The thermostat is set to cool but the unit is blowing hot air. In other words, the unit’s refrigerant is most likely leaking. If you look at your temperature gauge, and the engine is running hotter than normal, but there is not heat coming from the heater you may be having issues with the water pump. Satisfied Customers: 22,141. Hey everyone, I am having the same exact issue with my Nest Thermostat. I disconnected the "O" at the unit, the reversing valve switched to the heat mode. Air conditioners and heat pumps can actually freeze into solid blocks of ice. Turn the ring around and select Settings from the menu. Answered in 1 minute by: 4/9/2019. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? In that case it will blow hot air, not just room temperature air. Water Pump. This was during the winter, so I wasn't able to test the air conditioning, but heat has been working fine. Don’t worry. It’s not a heat pump. There's nothing worse than driving through a rainstorm on a cold day and having to pump chilly defroster air onto the top of your head because your heat isn't working! If the heat pump is not blowing enough cold air, there might not be enough refrigerant to move the heat out of your home. One is a heat pump (the picture with bla... Nest 3rd gen heats when on cool setting Help . Normally orange should go to *OB but you do need to tell nest that it is an O for a heat pump. Why a Heat Pump Will Blow Cold Air. I installed a nest the thermostat blows hot when ac should be on. Ask Your Own HVAC Question. Select the Equipment option. That worked like a charm! Model GMS80704BXCC. He thinks it may be the water pump blades wearing, or even a slight crack in the cylinder head gasket - the latter seems very unlikely to me. The heat pump may be blowing warm air; it just does not “feel” warm. When the heat of summer is beating down on your home, the last thing that you want your air conditioner to do is start blowing out hot air. 2:56. Weird but true. You can do this by following the steps given below. You’re busy – and so is your family. 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). If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it’s easy to fix on your own. Dirty air filter. And what about the filters? Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. Why tell this story? Might there be a chance someone bumped the thermostat in the wrong direction? Make sure the thermostat is set to “AUTO”, not “ON”. 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. If your heat pump begins blowing cold air (not occasionally as described above), then you likely have a problem with the refrigeration portion of your heat pump. who has completed a thorough check but is unable to confidently diagnose the problem. In other words, it's not putting out any heat at all. Hot air blowing in cooling mode on Nest. I did some research before posting here, and have tried the following:-double checked my wiring. Member. Thermostatic Controls - Nest Heating Only, Cooling blows warm air - Hey All, Just installed a nest thermostat, ran through the test but the unit only blows warm air. Experience: 20yrs in the HVAC industry with certificates and degrees. It could even be running in the air conditioning mode due to a malfunction. I followed the wiring guide and during the winter the Heating Stage 1 and 2 worked great. Check the breaker box to see if the outdoor unit’s circuit breaker was tripped. Well this could be caused by several things. The good news is that, in many instances, the problem can be easily resolved by you with a simple flip of a switch or change of a filter. I tried to cool my house for the first time and all that was coming out was hot air. If it’s dirty, change it! But if the outdoor unit has no power, your blower just blows cold air over a cold coil. If it has been turned off for awhile and we turn it back on to cool (fan set to auto), it will blow at what seems to be room temperature for awhile (5-20 minutes) and then turns to hot air again. Contractor's Assistant: Did you double-check the thermostat's settings? The air coming from your supply vent should be anywhere from 15-30 degrees hotter than the air near your return vent (depending on how cold it is outside). If so, reset it. Three D-I-Y Fixes for A/C Blowing Hot Air . But the heat pump was also just very old, and repairing it would have cost nearly the same as just getting a new one, which is what they ended up doing. Join Date: Jun 2018. HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago. I arrive to find the outdoor unit running, vapor line covered in frost. No way, thats impossible on a 100 degree day. is it blowing hot air or room temperature air? The heat pump isn't switching I Got a Nest 3rd gen thermostat. Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. It worked fine before. Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no heat, its cool air. Most heat pumps (the O type heat pumps) will run in heat mode if there is no voltage on the O line, or if the valve (I forget what it's called, not HVAC professional) that changes between heat pump and AC has failed. Other times the fan isn't blowing at all, but you can feel heat creep out of the vents. This isn’t a problem when it’s 55 degrees outside—your system will expel air that’s a toasty warm 110 degrees or so. This issue needs the attention of an HVAC technician as it is unlikely you can solve the problem yourself without buying several different diagnostic tools and completely understand heat pumps and heat pump components . Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no heat, its cool air. The refrigerant is not the only part susceptible to leaks. The fix? To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Living without your AC can be annoying. Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. With the new Nest Thermostat installed, my A/C is only blowing cold air. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to … If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. If this doesn't work give Nest a call as they are good walking you through things step by step. Below is a list of possible causes. Category: HVAC. It has been working fine since i installed it a year ago but suddenly tonight it started to pump out hot air even tho the nest is on Cool and the screen was blue. The frozen part is the evaporator coil, which can block the cool air flowing into your home. No dice. No a/c, just a goodman gas furnace blowing into house thru vents. Posts: 2 Received 0 Votes on 0 Posts Wow! Nest Thermostat not blowing cold air. Is there any way to ensure that isn't being caused by the replacement Nest thermostat? Nest Heat Pump suddenly blowing Hot air on the AC setting. The heat pump isn’t actually blowing cold air, it just feels like it; Your heat pump is blowing cold air because it’s in “defrost mode” Something’s actually wrong with the unit and requires a professional; Not sure which of the above describes your situation? Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. One moment … I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. Improper thermostat setting. Nest Thermostat not blowing cold air. Thanks a … When I first installed it, it was only blowing hot air. Nest replaced the device and I installed it with no issues. Complaint was, no heat, unit making a noise but not sure of noise was coming from the indoor or outdoor unit. This is one of the most common calls we get during the summer. Hot air blowing in cooling mode on Nest. My A/c then only blew cold air. Heat pump not heating. Meaning no hot air for you. Model GMS80704BXCC. Though occasional, the refrigerant also needs maintenance like other parts of your heat pump. Yes Press the ring on the thermostat so that you can access its menu. Try taking the vehicle out of gear and revving the engine a little. In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Nest Thermostat Install Video - … Contractor's Assistant: Do you plan on doing the work yourself? It will also need to be replaced by a technician. also the blower was not blowing. Got it hooked up, and discovered it was blowing hot air. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. Nest Heat Pump Wiring Diagram: ... Nest Thermostat Blowing Hot Air on Cool After Installation - Duration: 2:56. the fiX files 35,217 views. 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