Now that it's starting to warm up, the air conditioning is just blowing hot air, not cool. Normally orange should go to *OB but you do need to tell nest that it is an O for a heat pump. In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Is there any way to ensure that isn't being caused by the replacement Nest thermostat? 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). Nest Thermostat not blowing cold air. Some systems are B for heat pump. Got it hooked up, and discovered it was blowing hot air. HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago. I have 2 nest, the one upstairs is connected to the heat pump. I recently went from an old AC unit, to a new Nest 3rd Gen. 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). Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? 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. Why tell this story? 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. Why a Heat Pump Will Blow Cold Air. Improper thermostat setting. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? With the new Nest Thermostat installed, my A/C is only blowing cold air. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Thread Starter. The heat pump may be blowing warm air; it just does not “feel” warm. That worked like a charm! 2:56. When I first installed it, it was only blowing hot air. This is one of the most common calls we get during the summer. Thanks a … It will also need to be replaced by a technician. No way, thats impossible on a 100 degree day. 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. Hot air blowing in cooling mode on Nest. Category: HVAC. Satisfied Customers: 22,141. Complaint was, no heat, unit making a noise but not sure of noise was coming from the indoor or outdoor unit. Meaning no hot air for you. 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. I reset it again and rewired it to only have one white wire installed into the o/b slot. 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. There are a few reasons your heat pump could be blowing cold air. You might also want to check your ductwork too. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. Contractor's Assistant: Did you double-check the thermostat's settings? Press the ring on the thermostat so that you can access its menu. You can do this by following the steps given below. Hi, I have two nest controlled unit. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. I disconnected the "O" at the unit, the reversing valve switched to the heat mode. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. Heat Pump Thermostat Set to Cool, Blows Hot Air The thermostat is set to cool but the unit is blowing hot air. No problems with heat or cool until this morning. I installed a nest the thermostat blows hot when ac should be on. It’s not a heat pump. Make sure the thermostat is set to “AUTO”, not “ON”. One is a heat pump (the picture with bla... Nest 3rd gen heats when on cool setting Help . Posts: 2 Received 0 Votes on 0 Posts Wow! Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Three D-I-Y Fixes for A/C Blowing Hot Air . The frozen part is the evaporator coil, which can block the cool air flowing into your home. Turn the ring around and select Settings from the menu. Share this conversation. My A/c then only blew cold air. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. My un... Nest Heating Only, Cooling blows warm air. Ask Your Own HVAC Question. Weird but true. 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to … I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Well this could be caused by several things. Contractor's Assistant: Do you plan on doing the work yourself? I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. I've tried troubleshooting. If it’s dirty, change it! No a/c, just a goodman gas furnace blowing into house thru vents. 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. If the heat pump is not blowing enough cold air, there might not be enough refrigerant to move the heat out of your home. Living without your AC can be annoying. But if the outdoor unit has no power, your blower just blows cold air over a cold coil. HVAC Guru, HVAC TECH. It could even be running in the air conditioning mode due to a malfunction. Upvote #3 06-05-18, 07:06 PM S. sn00py22. One moment … 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 . Hot air blowing in cooling mode on Nest. You’re busy – and so is your family. The heat pump isn't switching I Join Date: Jun 2018. Model GMS80704BXCC. Both of these problems can be beyond frustrating. 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! 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