The outdoor unit nabs heat from the outside air and transports it to the inside coil where the blower then distributes your cold air over that hot coil. 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. Heat Pump Stuck in Aux Heat Mode. Looks like you're using new Reddit on an old browser. You might have a failed heat strip kit as heat strips are a common emergency heat source for heat pumps. Filters clean the air headed into the furnace and the heated air sent back into the house. If it does then hvac problem. 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. Check to … This is allowable because the indoor coil (condenser in the heating mode) is upstream of the AUX heating elements. After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. Try moving the white wire to W1. Moved into a new house a few months ago and it has a nest thermostat. If you live anywhere in the Twin Cities area and your furnace is blowing cold air (or not working at all), MSP Heating can help. The auxiliary heat (electric resistance heat, or back-up heat) is minimized since it is more expensive. Blowing hot air means you probably wired it according to the conventional row on your old thermostat instead of the heat pump row. Auxiliary heat/ Emergency heat helps the heat pump keep up when cold outside or the temperature differential on the thermostat is large. some systems have the wires 'crossed'. 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. So if gas furnace it has failed. Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. Nest should still treat it like aux heat. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? CHECK. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. The two different names refer to the same thing: an electric heating system using resistive … I suspected an air lock in the heating system. By using our Services or clicking I agree, you agree to our use of cookies. 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. I also see the Blue, White, Yellow, and Brown wires traveling back out to the Heat Pump. May be something as simple as a switch or breaker is turned off. If it was, it would have a spinning fan icon on the display. BUT, for the aux heat test, the air is not warm, and feels like room temp or slightly colder. Check that shit 10 times. This happened to me. The ecobee asked this cause it assumes you have aux heat, is it electric? Auxiliary heat is the electric heat strip in your air handler that is supplemental heat. Cookies help us deliver our Services. This test will make Nest think the aux heat is a/c. Test #1: Tape off the white wire. 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. 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. Here is the old thermostat wiring: Original Thermostat Wiring, This wiring was copied to the Nest: Nest Wiring. If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. Probably a stupid question but is it a fan setting? For now you could pull the Nest off of its base and disconnect the wires going to W1 and W2. I have also tried removing the Nest and re-installing the original thermostat and confirmed that the heat does still work with the old thermostat. Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles. You see, a heat pump heats your home by moving heat from the outdoor air into your home. Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. Compromised flame sensor. 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). Give us a call or contact us online . Turn off power to the furnace. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Run fan every hour for x mins.. Locate the pilot light assembly and turn the reset switch to OFF. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. 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. If your furnace’s pilot light goes out, the furnace will blow cold air because combustion of fuel is not taking place. Since you don't know if it ever worked calling in a pro might be best. Rebecca, if I were close to where you live, I would come out and take a look at your system and … Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. Not sure the - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Came home to a house at 108 degrees after a weekend visiting friends. Press J to jump to the feed. If the walls of your home are too cold and your heat pump is not powerful enough, AUX heat may be needed in order to make up the degrees. For a heat pump or heater to produce warm air, air must flow easily through the … theres a setting you can change to fix this. Here’s how it works. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Items in red usually require a service call. YOUR. We also tried bypassing the heat pump entirely and just using auxiliary heat but not luck. New comments cannot be posted and votes cannot be cast. 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". If it doesn't then a bad Nest. Filed Under: HVAC Tagged With: AC, air conditioning, heat pump, hvac. 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). It could even be running in the air conditioning mode due to a malfunction. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. If it doesn't give heat then incompatible (though others have a system like yours). Aux on the thermostat stands for auxiliary heat. Your heat pump might not actually be blowing “cold” air. Press question mark to learn the rest of the keyboard shortcuts. I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Press question mark to learn the rest of the keyboard shortcuts, Outdoor Cam IQ, Hello, Protect, Therm Gen3, Secure, Yale Lock. Do you know what setting it is to change? The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. Discussion on Google Nest products, including installation and configuration. When overheating, your furnace can trip a high limit switch, causing the furnace burners to … If it does then hvac problem. Do you use propane for back up heat? To remind yourself, write yourself a note or put a reminder on your phone telling you to turn the thermostat to cooling mode every time summer approaches. If you don’t have an IR thermometer, simply watch your thermostat. Are you out of backup heat? 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. 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. Then put the green wire on W1. Does the wiring at the air handler seem correct? It blows cold air when the heat is on. Now let’s say it cools to 26 degrees outside. This is because your outdoor heat pump will have a more difficult time creating enough warm air to heat your home. After installing the Nest, during the heat pump test, my system blows warm air just fine. The auxiliary heat pump should run more often when the temperatures outside dip below freezing. Why a Heat Pump Will Blow Cold Air. In other words, it's not putting out any heat at all. Have an expert inspect your ducts along with the furnace. If this gives heat then the W1 is bad. 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. But if the outdoor unit has no power, your blower just blows cold air over a cold coil. Details This should run the heat pump only. Meaning no hot air for you. Below is a list of possible causes. Well this could be caused by several things. This test will make Nest think the aux heat is a/c. I hired a hvac guy to inspect it. The fan should kick in along with the heat coils. If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. AUX heat can also start if the pump can’t handle the outside heat on cold winter nights. The pilot light needs to be relit to burn fuel and heat your home. Currently I have my nest wired as Yellow - Y1, Orange - Y2, Green, G, White - Disconnected from W2 Aux, and Red - RH. 6. Off topic here, but did you drop your Nest thermostat? The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. So if gas furnace it has failed. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. The wiring from the original thermostat was copied to the Nest and the jumper was removed. 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. Important Notes on Nest Thermostats You don’t have to connect your Nest thermostat to your Wi-Fi network. You may have noticed a loud sound right before cold air blows out through the vents in your home. WIRING. 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. Thermostat said cool but was wired to heat. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Otherwise you will need reverse engineer and figure out what you have and how Nest should be set up. Clogged air filters could be causing cold air to blow out of your vents. We’ve been helping homeowners in the Minneapolis-St. Paul metro area with their heating, plumbing and air conditioning problems since 1916. In a package system the heat pump may run simultaneously with the AUX heat. The heat pump starts pumping hot refrigerant from the outdoor coil through the copper tubing and through indoor coil. Using Auxiliary Heat with a Nest Thermostat. Wiring a Nest thermostat if your Nest thermostat is heating up your house instead of cooling it down. If it doesn't then a bad Nest. Then run the aux heat test to see if the blower kicks on. There may be a problem with the W2 connector. Test #1: Tape off the white wire. 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). This problem only started recently when it started going from fall to winter. With the old thermostat, heat works normally (even in the 10-20F outdoor weather we are currently experiencing). I had a similar problem a while back but the blowers would slowly warm up slightly and then drop back to blowing cold air. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? But it is definitely still heating your home. Like say it out loud to yourself while you’re doing it. 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. https://nest.com/support/article/How-does-Nest-manage-different-stages-of-heating-and-cooling. If it’s a particularly cold day or night, your heat pump might just be blowing air that’s cooler than your body temperature, making you think it’s cold. The important thing to remember is that “AUX” heat is fast and dependable but it’s also more expensive than heat transfer heating. Emergency heat is the same thing as auxiliary heat. 11. Wait 10-15 minutes to allow any escaped gas to clear the area. Then put the green wire on W1. Clogged Air Filter. Is this normal? Yup, that was one of the things we tried on the phone with nest support. Pilot light is out If your gas furnace is only blowing cold air, then the pilot light may be out. When I got home from work last night the house was 83 now it’s 72. I’m renting the house and it came with the nest. Then run the aux heat test to see if the blower kicks on. A dirty, clogged filter limits the airflow, eventually causing heat and pressure to build up in the furnace. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. IE. 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. 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). So turn the thermostat temp down so it goes blue (cooling). When the engine was cold I removed the cap from the coolant header tank and checked the level which appeared to be correct. Once the frost builds up, your heat pump automatically goes through what we call, a defrost cycle to keep allowing the air to flow across the coil freely (which is a necessary function of your system). Discussion on Google Nest products, including installation and configuration. When hooked up like this my Nest say Cooling Stage 2 and blows cold air. Set the thermostat to cool mode, a few degrees below your room’s temperature, so the thermostat calls for cooling. Homeowners who notice their auxiliary heat rise as … Haven’t had any issues with it until the past few weeks. Literally a wire was in the wrong hole. 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. Check the furnace’s air filter Your furnace may be blowing cold air because the filter is too dirty.
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