furnace intermittently blows cold air
Use the list below to investigate the causes and what you can do to solve them. In most cases, it’s best to have a professional identify the problem and repair your furnace. Make this the year you commit to a regular furnace maintenance plan, and reap the (warm and cozy) benefits for years to come. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Hi brilliant people, First, hope you are having a great holiday. This is similar to rebooting your computer to fix a software glitch. We notice that sometimes there will be a short blast of cool air coming out of the vents. But when it stops blowing hot air and starts blowing cold air, you know you have to find a solution. Local residential furnace installation expert Sierra Air shares some troubleshooting steps that you should do in this case. This video will show you where you should start with your furnace troubleshooting. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. That’s why the furnace is not blowing hot air. If you haven’t done that yet this winter, call in an HVAC service expert to keep your system in top shape and prevent unexpected failures. The last thing you want to find is that the furnace is not heating. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. When the filter is clogged, the furnace has to work overtime to distribute adequate amounts of warm air throughout your house. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. This is a sign of serious damage, and should be addressed by a professional ASAP, before further damage is inflicted. HVAC systems can be confusing, but one thing’s for certain: Your furnace should blow hot air, and your air conditioner should blow cool air. Lighting & Ceiling Fan Installation & Repair. This guide can help you evaluate or fix the problem. Inadequate gas supply. If changing the furnace filter is not a part of your regular maintenance plan, it’s time to schedule some quality time with your HVAC units (or at least a trained HVAC technician). But if you’ve set your fan to be “on” at all times, it’ll blow cold air during the furnace downtime. Anything under 10.5 will result in the fan operating but just blowing cold air as the gas valves will not open. If you want help from us, you'll have to tell us the make and model of both the furnace and thermostat. Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Furnaces can overheat for a variety of reasons, including: Your gas supply could be turned off. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If you notice that your furnace is blowing hot air at times and cold air other times, your fan is likely set to ON when it should be set to AUTO. If it is neither of these reasons causing the issue, try turning the fan switch to "on" to force the furnace to start blowing air. Unlike a furnace that puts out a lot of heat for short periods of time, a heat pump will put out less heat for longer periods of time. Count your blessings that this time you avoided an expensive furnace repair. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. Will only blow cold air. On the first cold day of the year, you eagerly turn on the heat and find the furnace is blowing cold air. Gas furnaces produce air that is 130-140°F range. If you know how, you can clean or replace the filter yourself, but it’s messy and not as easy as an air filter so you may want to leave this job to the pros. Since heat pumps produce air that’s below that, it can feel cold to you. When the furnace kicks on, the air you feel should be warm. 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. If your furnace is blowing cold air, not blowing any air at all, or making odd noises, it’s important to schedule a repair as soon as possible. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. If the thermostat is going bad it may work intermittently. Contact Blanton’s Air at (910) 249-4898 for all your Fayetteville or Raleigh, NC HVAC and plumbing needs. Cold air blowing from your unit may result from a problem with the thermostat. Long story short. Your Fan Is On. What I'm dealing with: My controller is a White-Rodgers (model 50A50-298). If you’ve had the thermostat for a while, the battery might be low. 1. When the furnace is turned on after a certain period, whether it be days, weeks or months, turning on the system does not mean that warm air will automatically begin to pass through the vents. I have York furnace TG8S 80% AFUE that has been used for 5 years. We live in the northeast, so we haven't used the A/C yet, just the heat. 5:45AM edited 5:45AM in Gas Heating. If your furnace fan intermittently blows cold air or stops blowing warm air all at once, check a few things before calling a professional. If the unit is constantly running, or intermittently blowing cold air, it is time to call a professional for the job. Blanton’s is prepared If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. I have York furnace TG8S 80% AFUE that has been used for 5 years. Your thermostat’s fan setting. Try turning the furnace off via the power switch. 3 years ago . And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. There are a few major reasons why your furnace is blowing cold air. If the furnace in your Thomasville area property is only producing cold air when all you need is heat, then don't hesitate to call in the heating and cooling experts of All Comfort Control Heating and Cooling to assess the problem. Furnaces aren’t running 24 hours a day (unless you’re constantly increasing the temperature in your home). But you need to know when to call in the furnace repair pros so you don’t have to spend unnecessary time in the cold and interrupt your business. If you have a newer furnace with an electronic control panel, you may need to reset the system. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. Here in the New York City area, we’re all pretty tired of the cold weather by now. ... Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Discussion Starter • #1 • Feb 28, 2017. If the fan is set to ON, it can cause the blower to run constantly even though the furnace is not heating the air. I have a mystery case with my furnace and I hope you could help me solve it. If I turn down the thermostat so the furnace stops, and turn the temp back up … Let’s Get in Touch. 11. If you have an oil-fired furnace, its filter can become clogged with dirt and debris, just like an air filter on a gas-fired system. Compromised flame sensor. 6. The lower half of the furnace contains an access panel with a round plastic window, through the window there is a red-light that flashes 3 times and pauses for 2 seconds and flashes 3 times again (I assume this is some sort of troubleshooting light). If you know how and you’re comfortable doing it, you can try to relight the pilot yourself. It ’s not too late to winterize your home heating and cooling systems with these essential HVAC maintenance steps. I'm having issues with my furnace. Another thing to check is furnace ignitor, it may be coming on like it should and trying to blow hot air but the ignitor is not actually firing the furnace. Have your system professionally cleaned to take care of this problem. 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. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. the unit could be firing and then shutting off too soon because the gas isn't flowing properly. If you have a newer furnace with an electronic ignition, such as an intermittent pilot or a hot surface ignition, your system may need adjustments or replacement of failed parts. Troubleshoot a furnace blowing cold air. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. If the pilot won’t light at all, you may have a faulty gas valve. If the furnace still blows cold air, call in a professional. What Can I Do If My Heater Is Blowing Cold … Although this may seem obvious, be sure your thermostat is set to heat and that it's actually colder in your house than the temperature the thermostat is set to. COVID-19 & Your HVAC System: Your Questions Answered, HVAC System Maintenance: 6 Tips for Heating Season, Essential Equipment for Commercial Kitchens: HVAC Make Up Unit. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. 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Of day problems can be prevented furnace intermittently blows cold air regularly-scheduled cleaning and maintenance before inspecting any further continuously without heat.
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