furnace running but not blowing air

29 dez furnace running but not blowing air

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