If it is, you probably have a dirty pilot light. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. 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. If it is, the problem might be a simple thermostat setting. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. If you find that you go to bed comfortable and wake up freezing because instead of your heater delivering warm air, it's blowing cold, it might be because the condensate drain has frozen. You can avoid expensive repairs by troubleshooting furnace problems before calling a professional. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Somebody else is adjusting the thermostat . When your furnace is blowing cold air your warm and inviting home can turn into an icebox in a matter of hours! After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. Before calling for repairs, check your fuel level. You may have a thermocouple-related problem, meaning the component needs adjusting or replacing. If you choose to call a professional to do the job for you, this would be a good time to have your system inspected. If your gas supply is not turned off, then you probably have a severed line. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO .”. If those flames fail to ignite, the furnace needs to know to close the valves so you aren’t pouring natural gas into the furnace. 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. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. Major duct problems In case of severed line case you’ll need some professional help. Solution. Have you changed your air filter lately? When the burners of your furnace are clogged, there won’t be enough fuel for your furnace to keep blowing out hot air. The thermocouple is a sensor that controls the gas valve and ignition. In other words; no vacuum means no ignition, which may be why you are experiencing cold air when you're expecting hot. If after refilling the tank your furnace doesn't turn on, it may be necessary to manually bleed and restart your furnace. If the flame goes out, then all is not well. if the switch is on, then check to see if the pilot light is dirty. How a furnace works is that a spark or flame ignites the gas that heats the coils in your unit.. I’d watched the repair guy do his 10 minute job, and it didn’t look difficult at all. If your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating ever when it is not putting warm air into your home. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Check for instructions on how to ignite your model’s pilot light. Clean it to ensure proper gas flow. If your pilot light did go out, try to relight it. What’s the problem? Inadequate gas supply. Improper Thermostat Settings. 4. They are available in electric, gas and oil models. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Icy cold air blowing from your vents on an already cold night is a dreadful experience. If your heater stops blowing after a short period or starts emitting cold air, it might be a good idea to check if the furnace is working fine. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. If you have a high-efficiency furnace and you see water pooling around the furnace. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. This is a likely cause if your furnace blows hot air, then cold. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Solution 3: If the pilot lights, but won’t stay lit, then there’s a problem with the thermocouple (the copper rod you see the pilot flame hitting). 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. There’s only one thing worse than a furnace not working, it’s a furnace blowing cold air. 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