Why a Heat Pump Will Blow Cold Air. If opening all of the vents doesn’t solve the problem, you may want to contact a local HVAC professional to evaluate your heating system and ductwork. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Pros recommend keeping at least 80 percent of your heating registers open to prevent unnecessary pressure in your furnace and ducts. If there is a reset button on your furnace, turn the valve to the pilot position and hold a flame to the dedicated pilot gas tube while pushing the button for about 30 seconds. If it won’t stay lit, it’s time to call a professional. Any idea? Well this happens sometimes and a few things can be the cause. Is the fan set to run constantly, even when the system isn’t heating the air? The coolant supply is blocked. This function allows the furnace to warm up the air before the blower pushes it out through the ductwork and into your living areas. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Inadequate gas supply. There are many reasons your car's heater isn't working. Start by turning your heater off and inspecting the filters. Your Fan Is On A dirty sensor can be simply cleaned by your local Carrier dealer for an inexpensive repair. level 2. How to Maintain and Service Your Home Furnace, HVAC Education, Buying Tips, Furnaces, Heat Pumps, Technology, HVAC Education, Buying Tips, Furnaces, Technology. Solution: Change the air filter and see if your furnace starts only blowing warm air. Blocking air increases the air pressure in your air ducts, which may both cause and worsens airflow leaks—particularly at joints and seams. If your furnace has a reset button (it’s often a red button located on the front, side or back of your furnace), try pressing it. Submitted: 6 years ago. In some cases, a malfunctioning thermostat may require adjustment or replacement. While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. Of course, for every reason a perfectly operating furnace is blowing cold air, there could also be a more serious issue lurking. While your first instinct might be to call your HVAC contractor, your furnace might be operating normally. A properly working flame sensor will shut down the furnace if it does not detect a flame while the gas valve is operating. Another common problem is when air gets into the cooling system. If the temperature in your home is cooler than the temperature you set on your thermostat, or if you hear your furnace start up and shut down quickly over and over, you might suspect a flame sensor has malfunctioned. If you notice the air temperature in your home is cooler than normal... if the airflow from your heat vents seems to be weaker than usual... and/or if you hear the furnace running for short periods of time before shutting down (short cycling), you may have a dirty air filter to blame. Since the 1990s, the industry has shifted to using pilotless ignition systems such as hot surface igniters, so pilot-related issues are becoming less common. Alternatively, they may have experienced a computer or clerical error that made them think you haven’t paid yet. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. 1 Answer. If you’ve checked all of the easy-to-remedy reasons that can result in your furnace blowing cold air and you still haven’t solved the problem, it may be time to contact your local Carrier® indoor comfort expert to see if your furnace needs to be serviced, adjusted or replaced. Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. Closed heat registers can cause other issues, as well. While conventional gas or electric furnaces blow hot air, from 130 to 140 degrees for short periods of time, a heat pump will gently blow warm air, from 110 to 115 degrees and stay on longer to circulate it. I am just wondering if I hooked something wrong hooking up the thermostat , or perhaps I have a problem with the heat pump and need to call someone out to fix the problem. If this is the case, properly shutting the door on your furnace may fix the problem. I came home from work and the house was 80 degrees. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core. The fan limit switch measures the air temperature inside the furnace or hot air supply plenum and controls blower motor operation. And you wait — and wait — but the heater just blows cold air. Compromised flame sensor. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? Major duct problems. I have checked for leaks but can't find any. What Is the Cost to Buy or Replace a Home Furnace? Check the Pilot Light on Gas Furnaces. Details Lack of maintenance can lead to build-up of dirt, dust and other airborne pollutants that can clog your filter, restrict airflow and lead to both discomfort or in more extreme cases, system failure. Perhaps your temperature gauge is running below normal. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. Your gas supply could be turned off. If none of these simple issues seems to be to blame when your furnace stops producing warm air, then there may be more complicated problems. The pilot light might simply just need to be re-lit, or the gas valve could have been shut off after last season’s use. 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). At the end of the heating process, it waits until the internal air temperature drops below its predetermined level, then shuts down the fan until the next heating cycle begins. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. fan speed, and vent option. Try kicking it up a notch to see if there’s a noticeable difference. 2010 Laramie recently had heater core and evap replaced after having the same issues described in this thread with heat on passenger side and blowing cold air on drivers side. Why a Heat Pump Will Blow Cold Air Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. The pilot light is a small flame that is always lit when you have the furnace turned on. 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. In such a case, there could be an easy solution, particularly if your thermostat setting is the problem. Not yet. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Next, locate the pilot light assembly on your furnace and see if there is a flame. If maintenance or repair work has recently been done on the furnace, this switch may have accidentally been left in the OFF position. Unreliable car heaters can make the cold winter months practically unbearable. The fan setting on your thermostat has two options, “on” and “auto”. Or, if you have a high efficiency, multi-stage furnace, it might be operating on low stage heating and you just aren’t getting that full-on blast of heat you normally expect. 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. 8 Common Problems With Conventional Gas Furnaces, Troubleshooting an Electronic Ignition Furnace That Won't Light, Troubleshooting an Intermittent Pilot Ignition System, How to Light the Standing Pilot Light on a Gas Furnace, How to Troubleshoot Electric Ignition Furnace Problems, How to Replace a Furnace Thermocouple or Electronic Flame Sensor, How to Check a Pilot Light on a Gas Furnace, Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler. So if gas furnace it has failed. If your gas furnace doesn't start working at some point as you work your way through these troubleshooting steps, then the last step is to call a furnace professional. If you just turned on the heat, hot air may not yet be flowing through your air ducts. Whether you are in the midst of a 110° heat wave or the arctic chill to end all arctic chills, you expect your HVAC vents to blast you with the desired dose of cold or hot air. A few days later on the way back home, roughly 2 hours into the trip, the heater was blowing cold air. If the furnace powers up, you should soon have heated air cycling through your home once again. 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. The heat from the hot coolant is what your heater normally blows throughout the inside of the car. One of the most common causes of cold air blowing is that your utility company has cut off the heat. If you still suspect the problem is a dirty air filter, consult your owner’s manual for instructions on removing and cleaning or replacing your air filter. The furnace blowing cold air, or there is no heat in the house. This can cause your furnace to lock down for safety. You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. Share this conversation . Look to these possible causes one at a time. With a heater blowing cold air, the first question to address is whether the cold air is blowing from the furnace right after the heater is turned on. Sometimes, pressing the reset button is all that is required to get your furnace working properly. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Then, if possible, remove the sensor from the furnace. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. Leaky ductwork not only leads to reduced comfort, it can result in higher utility bills because of the amount of heat lost due to the leakage. Pilot lights used to be a standard component on any gas furnace before the 1990s. Show More. I have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior. How to Relight a Gas Water Heater That Produces No Hot Water, 3 Things to Check When Your Furnace Stops Working. When a heat pump begins the defrost cycle, the outdoor fan shuts off and the system switches over to cooling mode. Report Save. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. 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. This will lead to heat blowing out cold air. A lack of heat can be a symptom of a much larger problem. If the pilot doesn’t light on the first attempt, wait a few minutes and repeat the procedure, this time depressing the reset button for 45 to 60 seconds. Until the engine warms up, there’s no heat for the heater core to extract. 2. Any ideas please. Also, check the electrical switch at the furnace to make sure it is in the ON position. If you don’t have an IR thermometer, simply watch your thermostat. Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting. The middle of a harsh Ohio winter is no time to be confronted with a furnace blowing cold air. My car has 180000 miles. A new furnace can offer higher energy efficiency, new product reliability and warranties, and no issues with pilot lights blowing out. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. A dirty air filter can restrict airflow, causing the heat exchanger to get too hot, and in turn causing the fan limit switch to shut down the furnace. Car is overheating Inspection: $79.99 - $89.99: Get a Quote : Marvin Sunderland. 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. This article applies to the Ford F-150 (2004-2014) and F-250 (2005-2014). The sound you hear is the reversing valve switching your unit over to cooling mode. 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. Because a pilot light is designed to burn continuously, it also uses more of your gas supply, which can be reflected in higher utility bills. If you’re unable to warm your home with your furnace, and you’re looking for Heating And Air Companies in Atlanta, Moncrief Heating & Air Conditioning can help. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. Your furnace may be blowing cold air because the filter is too dirty. Learn about our innovative products and how they can help improve your comfort. My heater is set for 70 but it is blowing cold air. A lot of air came out and slightly warmed but went cold again!! Check the furnace’s air filter. Neither your air conditioning nor your heater will be cold or hot right after you turn them on. When your furnace blows cold air, try turning the heating unit off and on. In other words, it's not putting out any heat at all. The hot coolant flows in one side of the heater core and out the other side headed back toward the engine. If you have a programmable thermostat, review your “comfort schedule” for any issues, and make sure your programmed settings haven’t shifted times due to daylight savings time. Changing the fan setting to auto will turn off the blower when the system is not actively heating. It could even be running in the air conditioning mode due to a malfunction. If you experience any of these symptoms in your home, the first step is the check the thermostat and look for the obvious answers. Your furnace may be blowing cold air because the filter is too dirty. Either of these would be a clue that a malfunctioning flame sensor could be causing your furnace to shut down. It continues to blow when it's in auxiliary also but w/o heat just air. If it’s dirty, change it! Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. 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