Why is my furnace blowing warm air not hot?
Check your thermostat’s settings, because your thermostat could be set to “Cool” which will limit your furnace from blowing hot air. Check that your air filter is clean and you don’t have a clogged air filter. Blocked air ducts can limit return air flow, which can compromise your furnace’s heat exchanger.
Why is my furnace blowing cold air instead of heat?
So Why Is My Furnace Blowing Cold Air Instead Of Heat? One of the most common causes of a furnace blowing cold air is not actually a repair at all. 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.
Why do I have a bad thermostat on my gas furnace?
Bad Thermostat. Your gas furnace will blow air through the system periodically, even if you do not have the heat on. It will circulate air constantly on certain air settings too. If you turn the heat on and this circulated air is not warm after a few minutes you may have a thermostat problem.
What should I do if my furnace is not working?
Solution: Change the setting from Cool to Heat. If the thermostat was just changed and the furnace blows cold air when it should be heating, the thermostat was either installed improperly or, more likely, it isn’t the right one for the HVAC system you have. Solution: If it was professionally installed, call back the installer.
Can a dirty air filter cause a furnace to overheat?
A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. Do this: Turn off your furnace at the thermostat, and check the furnace filter. If it’s dirty, change it.
So Why Is My Furnace Blowing Cold Air Instead Of Heat? One of the most common causes of a furnace blowing cold air is not actually a repair at all. 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.
What to do if your furnace won’t turn on?
Try changing the batteries. 2. Empty oil tank. If you have an oil-fired furnace, you may be out of fuel. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. 3. Problem with computerized controls. If you have a newer furnace with an electronic control panel, you may need to reset the system.
Why does my furnace fan run when the thermostat is on?
First, the furnace fan turns on automatically when your home’s thermostat detects that the house is a different temperature than what has been set. This causes your furnace to kick in and start heating up while the fan circulates the air. So your fan will only run when your furnace system is running. Should My Thermostat Be Set To “on” or “auto”?
Why is the pilot light on in my furnace not working?
If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. Do this: Try relighting the pilot light following these steps: Turn your thermostat from HEAT to OFF. The assembly and switch should be near the bottom of your furnace. Can’t find them? Check your furnace’s manual. Also, this image may help:
