I followed the wiring guide and during the winter the Heating Stage 1 and 2 worked great. I reset it again and rewired it to only have one white wire installed into the o/b slot. Answered in 1 minute by: 4/9/2019. The heat pump may be blowing warm air; it just does not “feel” warm. Try taking the vehicle out of gear and revving the engine a little. Check the breaker box to see if the outdoor unit’s circuit breaker was tripped. 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. 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 . Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. is it blowing hot air or room temperature air? I arrive to find the outdoor unit running, vapor line covered in frost. 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. Don’t worry. If it’s dirty, change it! 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. Though occasional, the refrigerant also needs maintenance like other parts of your 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. Nest Heat Pump Wiring Diagram: ... Nest Thermostat Blowing Hot Air on Cool After Installation - Duration: 2:56. the fiX files 35,217 views. 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). Join Date: Jun 2018. Weird but true. Member. 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. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. also the blower was not blowing. I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. Is there any way to ensure that isn't being caused by the replacement Nest thermostat? Turn the ring around and select Settings from the menu. 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. One moment … Heat Pump Thermostat Set to Cool, Blows Hot Air The thermostat is set to cool but the unit is blowing hot air. It could even be running in the air conditioning mode due to a malfunction. In that case it will blow hot air, not just room temperature air. Satisfied Customers: 22,141. There are a few reasons your heat pump could be blowing cold air. No dice. My un... Nest Heating Only, Cooling blows warm air. I have 2 nest, the one upstairs is connected to the heat pump. I tried to cool my house for the first time and all that was coming out was hot air. who has completed a thorough check but is unable to confidently diagnose the problem. Make sure the thermostat is set to “AUTO”, not “ON”. Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. No a/c, just a goodman gas furnace blowing into house thru vents. 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