How do I stop my furnace from blowing out cold air?

Check the Thermostat Fan Setting Go to your thermostat and take a look at the fan setting. Make sure the switch is set to AUTO, not ON. With the AUTO setting chosen, your furnace should only run the fan during a heating cycle and not push cold air through your vents in between.

Why does cold air come out when the heat is on?

Your Air Filter Is Dirty Clogged air filters could be causing cold air to blow out of your vents. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat.

Why does my heat pump feel like it’s blowing cold air?

When in defrost mode, a heat pump may blast cold air from its vents for 1 or 2 minutes (before the backup heat kicks in). This forces the outdoor coils to heat up, melting any frost or ice that has built up. And because the heat pump switched to cooling mode, it will blow cold air into your home for a few minutes.

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.

What happens if the pilot light on my furnace does not work?

If these fail to work your furnace will only blow cold air because there is no heat source to ignite the gas coming into the furnace. For furnace burner systems that use a pilot light, you simply need to relight that pilot light. This is best done using a long match.

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.

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 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.

Can a gas furnace pilot be turned off?

Those who have a furnace that heats the house will have a pilot that must be turned on in order to light the furnace quickly and allow it to heat the home. Like a gas water furnace, the pilot of a gas furnace can shut off for several reasons. If the gas pressure is low, the pilot may shut down.

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”?