Verified. Below is a list of possible causes. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. 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. Other times the fan isn't blowing at all, but you can feel heat creep out of the vents. Nest Heat Pump Wiring Diagram: ... Nest Thermostat Blowing Hot Air on Cool After Installation - Duration: 2:56. the fiX files 35,217 views. HVAC Guru, HVAC TECH. Heat Pump Thermostat Set to Cool, Blows Hot Air The thermostat is set to cool but the unit is blowing hot air. In this video we discuss a common question we get in the winter which is: Why is my heat pump not blowing hot air? Water Pump. 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. 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 . I did some research before posting here, and have tried the following:-double checked my wiring. Hence the hot air. Satisfied Customers: 22,141. Answered in 1 minute by: 4/9/2019. You might also want to check your ductwork too. 2:56. Is there any way to ensure that isn't being caused by the replacement Nest thermostat? I followed the wiring guide and during the winter the Heating Stage 1 and 2 worked great. You’re busy – and so is your family. Join Date: Jun 2018. Try taking the vehicle out of gear and revving the engine a little. 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. My A/c then only blew cold air. is it blowing hot air or room temperature air? That worked like a charm! If this doesn't work give Nest a call as they are good walking you through things step by step. But if the outdoor unit has no power, your blower just blows cold air over a cold coil. I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. Yes Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. In that case it will blow hot air, not just room temperature air. Member. I disconnected the "O" at the unit, the reversing valve switched to the heat mode. Select the Equipment option. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Hi, I have two nest controlled unit. also the blower was not blowing. Three D-I-Y Fixes for A/C Blowing Hot Air . Contractor's Assistant: Did you double-check the thermostat's settings? Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Category: HVAC. Press the ring on the thermostat so that you can access its menu. Share this conversation. No a/c, just a goodman gas furnace blowing into house thru vents. This was during the winter, so I wasn't able to test the air conditioning, but heat has been working fine. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to … Nest Thermostat not blowing cold air. Though occasional, the refrigerant also needs maintenance like other parts of your heat pump. If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. When I first installed it, it was only blowing hot air. I recently went from an old AC unit, to a new Nest 3rd Gen. Normally orange should go to *OB but you do need to tell nest that it is an O for a heat pump. Model GMS80704BXCC. 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. Got it hooked up, and discovered it was blowing hot air. 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. Posts: 2 Received 0 Votes on 0 Posts Wow! In other words, the unit’s refrigerant is most likely leaking. Nest Thermostat not blowing cold air. Don’t worry. And what about the filters? 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. 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. 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. 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. It’s not a heat pump. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. If so, reset it. Living without your AC can be annoying. Nest Thermostat Install Video - … Now that it's starting to warm up, the air conditioning is just blowing hot air, not cool. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. The fix? Heat pump not heating. 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. Dirty air filter. Why a Heat Pump Will Blow Cold Air. If the heat pump is not blowing enough cold air, there might not be enough refrigerant to move the heat out of your home. The heater is only blowing through cool air, the fans and blowers are working fine - he's been to a specialisist (!) 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. It will also need to be replaced by a technician. Experience: 20yrs in the HVAC industry with certificates and degrees. - 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. Make sure the thermostat is set to “AUTO”, not “ON”. Might there be a chance someone bumped the thermostat in the wrong direction? The heat pump isn't switching I I have 2 nest, the one upstairs is connected to the heat pump. Turn the ring around and select Settings from the menu. Air conditioners and heat pumps can actually freeze into solid blocks of ice. 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. You can do this by following the steps given below. One moment … Nest Heat Pump suddenly blowing Hot air on the AC setting. Thermostat for sure. It could even be running in the air conditioning mode due to a malfunction. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? Hi. If it’s dirty, change it! If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. 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