Hot air blowing in cooling mode on Nest. Nest Thermostat not blowing cold air. 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. Other times the fan isn't blowing at all, but you can feel heat creep out of the vents. Nest Heat Pump suddenly blowing Hot air on the AC setting. Improper thermostat setting. 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. 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. I reset it again and rewired it to only have one white wire installed into the o/b slot. Posts: 2 Received 0 Votes on 0 Posts Wow! This is one of the most common calls we get during the summer. One is a heat pump (the picture with bla... Nest 3rd gen heats when on cool setting Help . 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. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to … It could even be running in the air conditioning mode due to a malfunction. Press the ring on the thermostat so that you can access its menu. I have 2 nest, the one upstairs is connected to the heat pump. 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 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? The frozen part is the evaporator coil, which can block the cool air flowing into your home. 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. I recently went from an old AC unit, to a new Nest 3rd Gen. There are a few reasons your heat pump could be blowing cold air. Well this could be caused by several things. Experience: 20yrs in the HVAC industry with certificates and degrees. Meaning no hot air for you. The heater is only blowing through cool air, the fans and blowers are working fine - he's been to a specialisist (!) who has completed a thorough check but is unable to confidently diagnose the problem. I installed a nest the thermostat blows hot when ac should be on. That worked like a charm! Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. 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. Air conditioners and heat pumps can actually freeze into solid blocks of ice. 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. Nest Thermostat not blowing cold air. Weird but true. But if the outdoor unit has no power, your blower just blows cold air over a cold coil. The refrigerant is not the only part susceptible to leaks. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Hi, I have two nest controlled unit. 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. You might also want to check your ductwork too. 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). Heat Pump Thermostat Set to Cool, Blows Hot Air The thermostat is set to cool but the unit is blowing hot air. 2:56. 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. And what about the filters? Normally orange should go to *OB but you do need to tell nest that it is an O for a heat pump. Got it hooked up, and discovered it was blowing hot air. Thread Starter. Member. Try taking the vehicle out of gear and revving the engine a little. Might there be a chance someone bumped the thermostat in the wrong direction? The heat pump may be blowing warm air; it just does not “feel” warm. It worked fine before. Why tell this story? Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. Nest replaced the device and I installed it with no issues. is it blowing hot air or room temperature air? 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. HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago. Check the breaker box to see if the outdoor unit’s circuit breaker was tripped. Hi. Model GMS80704BXCC. Nest Heat Pump Wiring Diagram: ... Nest Thermostat Blowing Hot Air on Cool After Installation - Duration: 2:56. the fiX files 35,217 views. Now that it's starting to warm up, the air conditioning is just blowing hot air, not cool. No way, thats impossible on a 100 degree day. I followed the wiring guide and during the winter the Heating Stage 1 and 2 worked great. 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. Heat pump not heating. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? If that isn’t the problem, call a technician for help. With the new Nest Thermostat installed, my A/C is only blowing cold air. My A/c then only blew cold air. Complaint was, no heat, unit making a noise but not sure of noise was coming from the indoor or outdoor unit. Both of these problems can be beyond frustrating. You can do this by following the steps given below. Water Pump. HVAC Guru, HVAC TECH. Got a Nest 3rd gen thermostat. 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. Three D-I-Y Fixes for A/C Blowing Hot Air . Thermostat for sure. It will also need to be replaced by a technician. - 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. Some systems are B for heat pump. In other words, it's not putting out any heat at all. I did some research before posting here, and have tried the following:-double checked my wiring. Hot air blowing in cooling mode on Nest. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Hence the hot air. One moment … The fix? Join Date: Jun 2018. The heat pump isn't switching I If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. Model GMS80704BXCC. In that case it will blow hot air, not just room temperature air. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. In other words, the unit’s refrigerant is most likely leaking. Make sure the thermostat is set to “AUTO”, not “ON”. Contractor's Assistant: Do you plan on doing the work yourself? Dirty air filter. Ask Your Own HVAC Question. If it’s dirty, change it! My un... Nest Heating Only, Cooling blows warm air. 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. If so, reset it. No problems with heat or cool until this morning. 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. 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. also the blower was not blowing. Upvote #3 06-05-18, 07:06 PM S. sn00py22. Nest Thermostat Install Video - … Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Select the Equipment option. No dice. Thanks a … When I first installed it, it was only blowing hot air. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Share this conversation. I tried to cool my house for the first time and all that was coming out was hot air. 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 . In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Hey everyone, I am having the same exact issue with my Nest Thermostat. If the heat pump is not blowing enough cold air, there might not be enough refrigerant to move the heat out of your home. Yes If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. 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. Below is a list of possible causes. Answered in 1 minute by: 4/9/2019. If this doesn't work give Nest a call as they are good walking you through things step by step. Though occasional, the refrigerant also needs maintenance like other parts of your heat pump. Is there any way to ensure that isn't being caused by the replacement Nest thermostat? Living without your AC can be annoying. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? Satisfied Customers: 22,141. Verified. 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). No a/c, just a goodman gas furnace blowing into house thru vents. Turn the ring around and select Settings from the menu. 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. Contractor's Assistant: Did you double-check the thermostat's settings? I've tried troubleshooting. It’s not a heat pump. This was during the winter, so I wasn't able to test the air conditioning, but heat has been working fine. I disconnected the "O" at the unit, the reversing valve switched to the heat mode. Don’t worry. You’re busy – and so is your family. No a/c, just a goodman gas furnace blowing into house thru vents. I arrive to find the outdoor unit running, vapor line covered in frost. Why a Heat Pump Will Blow Cold Air. Category: HVAC. 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! Turn off the heat pump struggles to heat your home pump turns on when want! 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