Other times the fan isn't blowing at all, but you can feel heat creep out of the vents. Below is a list of possible causes. Model GMS80704BXCC. Yes If that isn’t the problem, call a technician for help. And what about the filters? I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Air conditioners and heat pumps can actually freeze into solid blocks of ice. Might there be a chance someone bumped the thermostat in the wrong direction? 2:56. This is one of the most common calls we get during the summer. Thermostat for sure. Hence the hot air. HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago. 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 new Nest Thermostat installed, my A/C is only blowing cold air. I tried to cool my house for the first time and all that was coming out was hot air. Satisfied Customers: 22,141. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. Is there any way to ensure that isn't being caused by the replacement Nest thermostat? I've tried troubleshooting. Try taking the vehicle out of gear and revving the engine a little. It will also need to be replaced by a technician. 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. 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. There are a few reasons your heat pump could be blowing cold air. 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. The fix? who has completed a thorough check but is unable to confidently diagnose the problem. 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. Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. It’s not a heat pump. 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. No dice. The heat pump isn't switching I I disconnected the "O" at the unit, the reversing valve switched to the heat mode. Nest replaced the device and I installed it with no issues. 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. You’re busy – and so is your family. Heat pump not heating. 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? 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! Some systems are B for heat pump. 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). I installed a nest the thermostat blows hot when ac should be on. If so, reset it. Posts: 2 Received 0 Votes on 0 Posts Wow! It worked fine before. This was during the winter, so I wasn't able to test the air conditioning, but heat has been working fine. My un... Nest Heating Only, Cooling blows warm air. Join Date: Jun 2018. Though occasional, the refrigerant also needs maintenance like other parts of your heat pump. Contractor's Assistant: Do you plan on doing the work yourself? Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Nest Thermostat not blowing cold air. Why tell this story? My A/c then only blew cold air. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. 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. Share this conversation. The heater is only blowing through cool air, the fans and blowers are working fine - he's been to a specialisist (!) Verified. In that case it will blow hot air, not just room temperature air. I arrive to find the outdoor unit running, vapor line covered in frost. 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. Answered in 1 minute by: 4/9/2019. Meaning no hot air for you. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. is it blowing hot air or room temperature 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 . 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 recently went from an old AC unit, to a new Nest 3rd Gen. Why a Heat Pump Will Blow Cold 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. You might also want to check your ductwork too. Dirty air filter. Normally orange should go to *OB but you do need to tell nest that it is an O for a heat pump. I have 2 nest, the one upstairs is connected to the heat pump. Experience: 20yrs in the HVAC industry with certificates and degrees. Don’t worry. 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. Thread Starter. Turn the ring around and select Settings from the menu. I reset it again and rewired it to only have one white wire installed into the o/b slot. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to … If the heat pump is not blowing enough cold air, there might not be enough refrigerant to move the heat out of your home. also the blower was not blowing. Contractor's Assistant: Did you double-check the thermostat's settings? Nest Heat Pump Wiring Diagram: ... Nest Thermostat Blowing Hot Air on Cool After Installation - Duration: 2:56. the fiX files 35,217 views. The refrigerant is not the only part susceptible to leaks. Three D-I-Y Fixes for A/C Blowing Hot Air . Make sure the thermostat is set to “AUTO”, not “ON”. The frozen part is the evaporator coil, which can block the cool air flowing into your home. Nest Heat Pump suddenly blowing Hot air on the AC setting. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. I did some research before posting here, and have tried the following:-double checked my wiring. Thanks a … Complaint was, no heat, unit making a noise but not sure of noise was coming from the indoor or outdoor unit. 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. Both of these problems can be beyond frustrating. 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