Why Is My Heater Blowing Out Cold Air? 5 Surprising Reasons!

Do you want to know why is my heater blowing out cold air? If yes, you come to the right place because we’re here to help you out! The thermostat alerts the control board within the heater to start the heating mechanism as quickly as the interior temperature dips below the thermostat’s predetermined temperature.

The gas valve, The ignition switch, and the exhaust fan are all turned on to start the combustion process. The heat exchanger in the furnace is warmed by combustion.

why is my heater blowing out cold air

Fuel gases are expelled outside via the heating element and air filter due to combustion. The heat exchanger is blown past by a blower fan that circulates ambient temperature air. The cold air removes heat and is then pumped through the ventilation ducts of your house. Let’s look at what causes your heater to blast cold air. So without further ado, let’s get started!


Why Is Heater Blowing Out Cold Air?

The failure of the ignition to start your heater might be the cause of it not blowing hot air. Your house will never get warm if the burners aren’t lit. Let’s look more closely at what could be interfering with the ignition process so that now we understand why is my heater blowing out cold air; 


#1. Bad thermostat

The thermostat is a crucial piece of equipment when it refers to warming your house. Whenever your home hits the temperature, you select to start the heating cycle, and your thermostat tells your HVAC unit to turn on the heat.  The thermostat transmits a signal to the circuit’s control board within the heater whenever the heating cycle is started. This entails switching on the heater burner as well as the blower. This is where issues can occur. If the heater is blowing colder air, the thermostat may be telling the blower motor to switch on, yet not your burner. The air pumped into your house would not be warmed unless the burners were turned on. You may also be interested to know about sign you need to replace your thermostat.


#2. A faulty circuit control board

The circuit control board may be to blame in some cases. The circuit control board of your heater acts as the furnace’s brain, transmitting commands to all of its parts. The circuit control board gets the heating cycle order from the thermostat and sends signals to the heater burner or blower to switch on. The circuit control board may switch on the heater blower but maybe not the heater burners if it’s faulty. If the heater isn’t pumping heated air, it might be because the circuit control board isn’t switching on the burners.

A circuit control board might fail for various causes, the most prevalent of which is a shortage of maintenance and cleaning. However, if your furnace is leaking water, pay attention. The circuit control board is now in danger of being permanently damaged. The dripping moisture might damage and deactivate the electronics connections on your circuit’s control board. It’s critical to repair a leaking heater before it leads to additional issues, including a lack of hot air.


#3. Failure of the pilot light

An ignition fault might be causing your furnace to spew chilly air. There will be no flames to warm the frigid air if your electric furnace ignition o0r pilot light is damaged. A tiny flame lights the burners using this function. You will probably get an Automatic Heater Ignition if you have a newer heater. For old heaters, pilot lights are indeed the usual.


#4. Because of a lack of fuel

If the gas heater refuses to start and blasts frigid air, the issue might be with your supply of gas. Maybe the gas valve is faulty, or you need to refuel. If you are using kerosene rather than natural gas, the fuel supply will deplete over time, so you’ll need to replace it to keep your system running.


#5. A faulty main limit

Another component, like any other, might become unclean or burnt out. A defective main limit switch can cause your heater to spew frigid air. The primary limit’s role, as previously stated, is to stop the ignition process if the element gets too hot. This safety mechanism protects your home from an excessively overheated furnace. However, if the main limit malfunctions, the burner safety cycle may be activated incorrectly. The heater may stop pumping warm air regularly as a result of this.

The heater blows cold air due to limited airflow. To perform effectively and appropriately, your heating system needs ductwork and outlets for optimum airflow. When one of these regions is obstructed or blocked, including by a blocked filter, airflow will be reduced, resulting in extremely cold temperatures everywhere in the house.


It’s A Wrap!

We hope you enjoy this article, and after reading it, you all will understand why is my heater blowing out cold air? Having a heater that blows cold air is very annoying, but once you read the reasons behind it, you can find out the source of this problem. You may also want to read about what kind of heater do i have and how a gas heater works. Thank you, friends, for being with us at the end, hope you enjoy this article!

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