The pilot is lit and has a nice flame. The cold air you feel is from the fan blowing it in because it is always running. Your filter is at the top of the list because it is most often the reason behind no or diminished air flow. Solution: Turn your thermostat’s fan setting to AUTO. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. If your thermostat’s fan setting is set to ON, the furnace blower will constantly run even when your furnace isn’t heating the air. Sometimes, it can be faulty ductwork causing you to feel lukewarm air on the other side. The furnace is old but the air cond. In heating mode the outdoor unit will blow cold air. Pilot – Most furnaces have an automatic electronic ignition. Your furnace will not turn on if your air filter is clogged. If you have a gas heater, check the pilot light. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. Your next step should be to check the furnaces air filter as this could cause the furnace to stop blowing air out for a few reasons. There are, incidentally, some common causes for why your furnace may be blowing cold air instead of warm, and what you can do to fix the problem. If the thermostat is fine and the pilot light burning, but the air never warms up, it’s time to check for damage. I pull the access panel off while the blower is running and it is spinning freely but not … Your System Was Just Turned On. No ice, filter had just been changed, the "insulated pipe" that he asked me to check was relatively cool - the pipe (no insulation) that was attached to it was ice cold. This is different from a furnace, which can blast hot air over 100°F. If your furnace is kicking on but not blowing air at all, the issue is likely with your blower fan belt. Chances are a simple reset was all you needed. In the end, it may not even be a problem with your furnace if it's not blowing hot air. If it is clogged, it has not been replaced as frequently as it should have! Once you’ve waited, stick your hand over vents to see if you can feel the cold air. Nearly everything you add to a furnace has resistance to air flow. If your furnace blows hot air sometimes and cool air at other times, you probably have your thermostat set to “ON”. If you’ve just changed the settings, wait for it to reset. The thermostat is set to “on” rather than “auto” When your thermostat is set to “on”, the fan in your heating and air conditioning system will run constantly—even when … This morning, I noticed the furnace is running, but air is not blowing out of the registers. The air blows cold but it barely trickles out of the vents. In this case, you'll need someone to come take a look at it, as your ducts are a network of intricate parts. Why is my gas furnace not blowing warm air even though the pilot is burning and the fan is blowing? Why Is My Furnace Making Weird Noises? Without proper air flow nothing will work well or efficiently. This will set the blower to run only when the burners run, so you shouldn’t get cool air coming from your vents anymore. Furnace not blowing hot air? If your furnace fan is still blowing, continue onto step 2… 2. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. That’s because air filters trap dust, dirt and debris like hair, which over time can restrict or block vital air flow, overheating the heat exchanger and preventing your furnace from working as it should. Why Is My Furnace Blowing Cold Air Sometimes? Cold air; Fan is constantly running; A good place to start is the thermostat. Do this: Go to your thermostat and see if your home’s temperature is reaching the set temperature and shutting off. Step 4: Check Your Air Filter if Your Furnace Won't Turn On. This is normal. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. Your furnace will not run with a triggered float switch, so if the float switch is up, this is the likely cause and your furnace won’t turn on. If it’s … Now your furnace will only blow warm air. 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. And because your furnace is no longer heating, the air being pushed into your home will be … 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. Maybe your furnace is blowing hot air, but it sounds like it’s housing a small family of grizzly bears. Can you test a furnace blower motor? runs constantly and can't get the temperature down. The fan setting on your thermostat has two options, “on” and “auto”. The fan is not moving and is making a humming sound. gbill2004 wrote: ↑ Twice today, the furnace started running, but would not start blowing hot air. Dirty air filters are often the culprit behind an inefficiently performing furnace. DIY types will find instructions for fan belt repair in their owners’ manuals, but this is also a good time to call in the pros. My Ruud gas furnace is blowing cold air. When I move the thermostat up, the furnace kicks on, but it never starts blowing. I have a gas furnace that is having the following symptoms. The gas furnace worked perfectly until the end of the season (about two months). If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. Before I call in a technician, I wanted to know if there are any things I can take a look at first -- like a reset button somewhere. One of the most common causes of a furnace blowing cold air is not actually a repair at all. How to fix it: Switch your thermostat to AUTO (see image below), so air only blows from your vents when the AC is cooling. Not realizing your high limit switch is dead (or even that such a part exists), you’ll be scratching your head on this one. They may need a change. Searching for Damage With such low volume of air blowing, the air cond. My day & night furnace, A/C unit is not blowing as strong as normal. My central air is not running. Do this: Turn off your furnace at the thermostat, and check the furnace filter. Should I be concerned if my home air conditioner compressor is blowing cold air? In newer units, the circuit board could be suspect as the relays are soldered to the board. You should keep your thermostat in the “auto” position so the fan will only push air through your air vents when the furnace is producing warm air. If you just turned on the heat, hot air may not yet be flowing through your air ducts. If the furnace is still blowing cold air, check the thermostat batteries. Any suggestions? To remedy that problem, it will turn on the fan to cool everything down. If yours is not electronic, consult your furnace owner’s manual and light it. though several reasons can cause this problem, there are a few things you can do before you call a professional. What to do: Set your thermostat to “AUTO” (see picture below). If the switch isn’t engaged, the system will not respond. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. Any suggestions? If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. It was fine up until yesterday, so I have no idea what is wrong. When you have your thermostat in the “on” position, your furnace will constantly blow air even if your furnace is not producing heat. Last year when the gas furnace was not working, I removed the direct spark igniter and lightly cleaned it with sand paper. A dirty filter causes these problems: Reduces volume of hot air blown out – Blocked return air means the furnace has less to blow out your supply vents, leaving you chilly. Check the furnace flame for a complete blue color. Furnace runs but no air is blowing through the vents If this is your first visit, be sure to check out the FAQ by clicking the link above. When it is chilly, having a heater that is not working is a major cause of concern. If so, everything is fine. is just 2 years old. This year I did the same and cleaned the flame sensor rod. This means your blower is running constantly, even when the burners aren’t on. Is your furnace only blowing lukewarm air rather than hot air? If you still don’t feel any cold air, there could be an internal wiring problem, causing the malfunction. In this case, consult a professional about next steps. Your thermostat is switched to ON. Firstly, the filter could be so saturated with debris and dirt that the air isn’t making it into the ducts which causes you to believe that your furnace isn’t blowing air out, when in fact it is, but the clogged filter is blocking it. I have a forced hot air gas furnace in my place. If not, read the next section about common heat pump malfunctions. Your furnace may be blowing cold air because the filter is too dirty. Make sure your fan is set to AUTO and not ON. When I turn up the thermostat, it does call for heat, but the air that is blowing is in no way hot. Your furnace might be running just fine, but the air blowing out of your vents feels cold. I assume you have a heat pump. Blower not running or running intermittently could be caused by a bad relay, bad capacitor, bad blower motor or a thermostat problem. Thermostat is Set Too Low – Make sure the thermostat is set to a higher temperature than your home, and running on “heat” mode. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. Usually I hear the furnace start, then run for 20-30 seconds, and then I hear a big whoosh when it starts blowing air. 3. You may have to register before you can post: click the register link above to proceed. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO.” For oil furnaces, check the oil supply and filter. After running for a few hours, lately, one of the copper tubes will be frosted up and the blower motor seems to spin fine but not … If the pilot light is out, that’s very likely the culprit behind the furnace not heating. If you’re noticing that your furnace starts blowing cold air here and there, not consistently, it may be because your thermostat is set to ON. I just changed out the air filter a couple of days ago, but other than that, haven't made any changes to the system. Here are some reasons this could be happening. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Today a couple times (not every time), it started but just kept running without starting to blow air. 2. If your thermostat switch is set to ON, that means the blower will run constantly—even when your system isn’t cooling your home, which will result in warm air blowing from your vents. Check the furnace’s air filter. Furnace shuts down – Because your furnace has to run longer to heat your home, the heat exchanger overheats, causing the furnace to automatically shut down. Check if your thermostat is set to ON instead of AUTO. You can hear it running and running, but it doesn't blow. Drain Lines – If you have a high-efficiency furnace, inspect your drain lines and make sure they are free of sediment and any debris build-up. Update: But meanwhile, from your end, all you see is the furnace blower running nonstop, blowing cold air and you have no idea why it’s happening. Gas furnace running, but not blowing? If your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating even when it is not putting warm air into your home. The cold air you feel is from the fan blowing it in. Checked each of the vents and no air was blowing out at all, however, the unit was running. 7 common reasons a heat pump blows cold air Filters, AC coils, duct work, registers … Should I be concerned if my home air conditioner compressor is blowing in! This year I did the same and cleaned the flame sensor rod does call for heat, but it starts. 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