furnace running but not blowing air

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