Let’s say it is 28 degrees outside, the heat pump is running 100% as designed, the home is maintaining 72 degrees and all the heat made so far is cheap heat. The auxiliary heat (electric resistance heat, or back-up heat) is minimized since it is more expensive. If it was, it would have a spinning fan icon on the display. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. 6. I suspected an air lock in the heating system. You may have noticed a loud sound right before cold air blows out through the vents in your home. The wiring from the original thermostat was copied to the Nest and the jumper was removed. Probably a stupid question but is it a fan setting? Auxiliary heat/ Emergency heat helps the heat pump keep up when cold outside or the temperature differential on the thermostat is large. If it does then hvac problem. Heat Pump Stuck in Aux Heat Mode. You see, a heat pump heats your home by moving heat from the outdoor air into your home. Homeowners who notice their auxiliary heat rise as … I’m surprised to see two white wires running to the W1 terminal on my air handler and starting to think maybe my system was wired improperly from the start. CHECK. Run fan every hour for x mins.. Check that shit 10 times. Test #1: Tape off the white wire. Turn off power to the furnace. When the engine was cold I removed the cap from the coolant header tank and checked the level which appeared to be correct. Meaning no hot air for you. When I got home from work last night the house was 83 now it’s 72. Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles. some systems have the wires 'crossed'. If your furnace’s pilot light goes out, the furnace will blow cold air because combustion of fuel is not taking place. We also tried bypassing the heat pump entirely and just using auxiliary heat but not luck. When hooked up like this my Nest say Cooling Stage 2 and blows cold air. Filters clean the air headed into the furnace and the heated air sent back into the house. Discussion on Google Nest products, including installation and configuration. So if gas furnace it has failed. Wait 10-15 minutes to allow any escaped gas to clear the area. This test will make Nest think the aux heat is a/c. Why a Heat Pump Will Blow Cold Air. The pilot light needs to be relit to burn fuel and heat your home. Moved into a new house a few months ago and it has a nest thermostat. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Then run the aux heat test to see if the blower kicks on. After installing the Nest, during the heat pump test, my system blows warm air just fine. Then run the aux heat test to see if the blower kicks on. Note: In some cases, your heat pump’s AUX heat could be a gas furnace, but since Phoenix typically has mild winters, some AZ homeowners will have electric resistance as their AUX heat. Have an expert inspect your ducts along with the furnace. The fan should kick in along with the heat coils. The two different names refer to the same thing: an electric heating system using resistive … The only differences that I see are that: Nest thinks the heat pump O/B wire is orange when it is actually brown, Nest thinks the aux heat W2 wire is brown when it is actually white. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. There may be a problem with the W2 connector. Filed Under: HVAC Tagged With: AC, air conditioning, heat pump, hvac. Wiring a Nest thermostat if your Nest thermostat is heating up your house instead of cooling it down. This is above my head but this article may help: https://nest.com/support/article/How-does-Nest-manage-different-stages-of-heating-and-cooling. Important Notes on Nest Thermostats You don’t have to connect your Nest thermostat to your Wi-Fi network. theres a setting you can change to fix this. With the old thermostat, heat works normally (even in the 10-20F outdoor weather we are currently experiencing). This problem only started recently when it started going from fall to winter. This is allowable because the indoor coil (condenser in the heating mode) is upstream of the AUX heating elements. Auxiliary heat is the electric heat strip in your air handler that is supplemental heat. This happened to me. Set the thermostat to cool mode, a few degrees below your room’s temperature, so the thermostat calls for cooling. New comments cannot be posted and votes cannot be cast. For now you could pull the Nest off of its base and disconnect the wires going to W1 and W2. Start with red to Rc, blue to C, green to G. Then remove Y (tape off) and put the white wire in the Y1 slot. By using our Services or clicking I agree, you agree to our use of cookies. Haven’t had any issues with it until the past few weeks. Literally a wire was in the wrong hole. Otherwise you will need reverse engineer and figure out what you have and how Nest should be set up. IE. With the Nest wiring, we have no heat in the aux heating mode (which we need right now as it is too cold for the heat pump). Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. https://nest.com/support/article/How-does-Nest-manage-different-stages-of-heating-and-cooling. If this gives heat then the W1 is bad. I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. WIRING. I hired a hvac guy to inspect it. I also see the Blue, White, Yellow, and Brown wires traveling back out to the Heat Pump. Locate the pilot light assembly and turn the reset switch to OFF. BUT, for the aux heat test, the air is not warm, and feels like room temp or slightly colder. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. Not sure the - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. This should run the heat pump only. But if the outdoor unit has no power, your blower just blows cold air over a cold coil. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? Test #1: Tape off the white wire. Nest should still treat it like aux heat. Emergency heat is the same thing as auxiliary heat. This test will make Nest think the aux heat is a/c. Clogged Air Filter. Came home to a house at 108 degrees after a weekend visiting friends. This is because your outdoor heat pump will have a more difficult time creating enough warm air to heat your home. YOUR. Are you out of backup heat? An evaporative cooler (also evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Currently I have my nest wired as Yellow - Y1, Orange - Y2, Green, G, White - Disconnected from W2 Aux, and Red - RH. Off topic here, but did you drop your Nest thermostat? The important thing to remember is that “AUX” heat is fast and dependable but it’s also more expensive than heat transfer heating. Start with red to Rc, blue to C, green to G. Then remove Y (tape off) and put the white wire in the Y1 slot. Press question mark to learn the rest of the keyboard shortcuts, Outdoor Cam IQ, Hello, Protect, Therm Gen3, Secure, Yale Lock. The auxiliary heat pump should run more often when the temperatures outside dip below freezing. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Blowing hot air means you probably wired it according to the conventional row on your old thermostat instead of the heat pump row. As fan blows air across that hot coil it becomes warm air.It seems the compressor is indeed running if the tubing is HOT at the outdoor unit. Give us a call or contact us online . Check the furnace’s air filter Your furnace may be blowing cold air because the filter is too dirty. Since you don't know if it ever worked calling in a pro might be best. Pilot light is out If your gas furnace is only blowing cold air, then the pilot light may be out. It could even be running in the air conditioning mode due to a malfunction. Discussion on Google Nest products, including installation and configuration. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. But it is definitely still heating your home. May be something as simple as a switch or breaker is turned off. 11. 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). I had a similar problem a while back but the blowers would slowly warm up slightly and then drop back to blowing cold air. After a few days of frustration and trying different Nest settings, I decided to open up the air handler and confirm the connections inside are correct. For a heat pump or heater to produce warm air, air must flow easily through the … If it does then hvac problem. To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. In a package system the heat pump may run simultaneously with the AUX heat. Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. I see the Yellow, Green, Brown, White, Red, and Blue wires are coming from the thermostat (it seems that orange and black are un-used). So turn the thermostat temp down so it goes blue (cooling). A dirty, clogged filter limits the airflow, eventually causing heat and pressure to build up in the furnace. When overheating, your furnace can trip a high limit switch, causing the furnace burners to … Details Rebecca, if I were close to where you live, I would come out and take a look at your system and … Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. Items in red usually require a service call. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Check to … It blows cold air when the heat is on. If you have a central HVAC (heating / ventilation / air conditioning) system called a "heat pump", and live in an area where the temperature in the winter goes below about 50°F (or 10°C) then you probably have something called "emergency heat" or "auxiliary heat". Clogged air filters could be causing cold air to blow out of your vents. Thermostat said cool but was wired to heat. We’ve been helping homeowners in the Minneapolis-St. Paul metro area with their heating, plumbing and air conditioning problems since 1916. Do you use propane for back up heat? Below is a list of possible causes. If you don’t have an IR thermometer, simply watch your thermostat. Looks like you're using new Reddit on an old browser. In other words, it's not putting out any heat at all. Yup, that was one of the things we tried on the phone with nest support. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? I’m renting the house and it came with the nest. If it doesn't give heat then incompatible (though others have a system like yours). If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Is this normal? Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. The heat pump starts pumping hot refrigerant from the outdoor coil through the copper tubing and through indoor coil. If your heat pump seems to be stuck on auxiliary heat mode and the temperatures outside are above 35 degrees, you should call the professionals at Precision Heating & Air. So if gas furnace it has failed. Here is the old thermostat wiring: Original Thermostat Wiring, This wiring was copied to the Nest: Nest Wiring.

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