asko heater blowing cold air

Wondering why is your Lasko heater blowing cold air? We’ll tell you why this is happening!

Lasko heaters are notable for their effectiveness in keeping houses warm. However, it also creates problems for homeowners, especially when it blows cold air.

Usually, this happens with heaters when they are used continuously without servicing so let’s learn more!

There are many factors that cause the Lasko heater to blow cold air, including blocked heater filters, turned-on fans, furnace glitches, clogged ductwork, or flame sensors. The solution only requires an overall inspection of the heater and thermostat for any faults!

Let’s move on further to discuss the causes of cold heater air briefly!

Why Is My Lasko Heater Blowing Cold Air?

my lasko heater blowing cold air

Most of the time, a heater will start blowing cold air even when it is functioning properly.

There are many potential causes for this disruption in heater performance including a component that is faulty, obstructed, or a fault with a device.

Let’s learn more!

The following are the most common causes of heater cold air:

  • Incorrect Thermostat Settings
  • Furnace Overheating
  • Blocked/Leaked Ductwork
  • Clogged Heater Air Filters
  • Dirty and Blocked Heater Flame Sensor
  • Blown Heater Circuit Fuse
  • Faulty Heater Coils
  • Incorrect Heater Fan Settings

Now let’s move further to discuss how easily you can fix this cold air issue from your heater!

How To Fix When Lasko Heater Blowing Cold Air?

how to fix lasko heater

Blowing cold air from the heater is now a very common issue that almost every heater homeowners have to face.

Fortunately, though, using the appropriate troubleshooting methods from our guide, you should be able to resolve this issue without difficulties!

Let’s jump right in!

Solution #1 Inspect Thermostat Settings

Most of the time, the heater temperature problem comes up because of any fault in the thermostat.

Anything whether it is the thermostat setting, dead battery, loose wire connection, or even its power failure may cause your heater’s cold air. 

Solution: Simply check the thermostat settings and setup to ensure everything works!
check the thermostat settings

Here is how you can check your Lasko thermostat!

  1. Go near your thermostat device and check its Temperature Settings
  2. Make sure the set temperature is higher than your room’s temperature. 
  3. If it’s not, then change the temperature on the thermostat.
  4. Next, make sure the thermostat is getting the proper power supply! 
  5. If possible, open the thermostat display to check that the wires are connected properly.
  6. Also, look for dead batteries alert on the display. 
  7. If you notice that the display is not working at all, replace the thermostat batteries.

After inspecting the thermostat, check whether your heater’s cold issue is resolved!

Solution #2 Check Fan Settings

check the fan settings

You should check the heater fan settings next after adjusting the thermostat’s temperature settings.

There’s a chance the fan switch is activated and the heater is blowing cold air because of the thermostat’s incorrect fan settings. 

This mostly occurs when the temperature set on your thermostat is lower than the room temp!

Here is how you can check heater fan settings:

  1. First, make sure the thermostat meter temperature is higher than your room.
  2. Then turn on your heater and locate a fan button on your heater panel.
  3. Once you locate it, turn the fan OFF.
  4. After doing this, your heater automatically sets to Heat Mode.

The Heat Mode means that the Lasko thermostat will start blowing warm air, but you still need to wait for at least several minutes.

The Lasko thermostat cold air will gently transfer to warm air.

Note: Move on to the next following methods, if this doesn't fix the problem!

Solution #3 Clean Heater Air Filters

clean the air filters

Blocked heater air filters are one of the common causes that almost lead to every problem with the heater.

Over time, dirt began to clog in the filter and built up a layer that prevents the heater from ventilation, and that device won’t provide warm air when the fan is turned ON. 

Here is how you can clean the heater air filter:

  1. Turn off and unplug the heater from the Power Outlet.
  2. Next, unscrew the heater to separate the outer and inner panels of the heater.
  3. Use a dry cloth to clean the upper part of the heating port. 
  4. Unscrew the heating port to clean it from the inside.
  5. Once you access the inner side, use a tweezer to remove all dirt and hair!
  6. Then use a vacuum to blow the dirt from the filter.
  7. Use any cleaning liquid to soften the clogged dirt on the filter and then wipe.
  8. Reassemble the heater components back by screwing them tightly.
When you’re ready, plug the heater into an outlet and check whether now it is blowing warm air or cold. 

In case the problem is persistent, keep reading the next solutions in the guide!

Solution #4 Cool Down Furnace

cool down furnace

After cleaning the heater air filters, if you still feel cold air, then check whether the furnace works properly.

Due to continuous use, the furnace often gets overheated and which is why it turns on the protection switch to prevent any damage.

This stops the heater from providing warm air. 

Solution: The only way to fix this issue is to wait until the furnace cools down.

Here is a way to fix the furnace issue:

  1. Unplug the heater from the power outlet.
  2. Wait for at least 30 to 40 minutes to cool down the furnace temperature.
  3. Once it cools down, plug the heater back into the outlet.
  4. Check to see whether the cold air issue is resolved.
Note: Again, you’ll need to be patient for a couple of minutes until the warm air starts!

Solution #5 Unclog Ductwork

unclog the ductwork

Aside from the thermostat, your home ductwork may also sometimes become the cause of heater cold air.

When the ductwork is completely clogged, it prevents the airflow that causes the heater to overheat, which causes the safety feature to activate and blow cold air! 

  • All you have to do is to check and unclog the ductwork to clear the airflow!

Here is how you can check the ductwork:

  1. First, get access to your home air ducts.
  2. Then use a shop vacuum to clear all the clogged dirt from the duct.
  3. Vacuum it multiple times, so all the dirt is unclogged properly.
  4. While cleaning up, also make sure that there is no leak in the air ducts.
  5. After doing duct cleaning, check whether the cold air issue is resolved from the heater.
Note: If you cannot clean the air duct properly, then contact professionals for proper cleaning!

Solution #6 Unblock Heater Flame Sensors

unlock heater flame sensors

The Flame Sensors have a crucial role while discussing heater cold air because dirt on the flame sensor affects its performance.

The flame sensors often get a dust layer or a residue that interrupts their working and thoroughly cleaning the component is all you have to do!

Here is how you can clean heater flame sensors:

  1. Unplug the heater from the Power Source.
  2. Next, unscrew the heater bracket and locate the flame sensor in the heating element.
  3. Use a dry cloth or air to clear the sensor dirt.
  4. Also, make sure to clean those parts as well, where you notice dirt or any clogs.
  5. Reassemble the heater’s components back and screw them tightly.
  6. Then, take a damp cloth and clean the outer sides of the heater as well.

In case the problem is persistent, keep reading!

Solution #7 Replace Heater Coil

replace the heater coil

If your heater is still blowing cold air after trying the aforementioned repairs, it’s possible that the heating coil in your device is malfunctioning.

That’s why air isn’t heated because there’s a chance it will become damaged or stop functioning properly. 

Here is how you can replace the heater’s coil:

  1. Unscrew your Heater Bracket.
  2. Then carefully inspect for any circuit breakage or faulty component. 
  3. If you notice any, then replace them right away.
  4. Next, check the Heater Coil Line for any damage. 
Note: If you are not professional in replacing components, then it's better to call a technician!

Quick Recap:

Whenever your Lasko heater blowing cold air you first need to make sure the thermostat temperature is higher than your room temp and ensure the furnace is not overheating. In addition, clean the heater air filters, unclog ductwork, and clean the heater flame sensors!

Visit our blog for more Lasko heater troubleshooting guides!

Nicole B