Why Won’t My Air Conditioner Blow Cold Air

By | June 30, 2022

“My air conditioner is running but it’southward not blowing cold air. What might exist the problem?”

When air conditioners malfunction, non bravado cold air is i of the nigh common problems. There is nothing worst than looking at the Air conditioning running merely not cooling (blowing
80°F
or even
90°F
output air temperature in the middle of summertime). You’re spending electricity and sweating in your home at the same time.

About
20-thirty%
of homeowners experience the

“air conditioner non bravado cold air”

problem. At first, it might seem like an inconvenience. Every air conditioner has 1 function; to cool your dwelling. It isn’t non cooling your dwelling house, it’s non doing its task properly.

Non cold enough cooling coils will cause Air-conditioning not to accident cold air. In that location are several reasons why that might happen.

Secondly, however, the air conditioner stopping to blow cold air while all the same running is something to be alarmed about. AC unit not blowing cold air might exist an indication of a bigger problem
(compressors issues, thermostat issues, low freon levels, etc.).

If this Air conditioning problem is non dealt with properly, running an Air-conditioning that is non blowing cold air
might put your whole Air-conditioning in danger. When central Air conditioning is not blowing cold air, for example, you want to close it off to preclude farther harm to a $3000+ unit of measurement.

Fortunately, in that location are a
number of known causes for air conditioners not bravado cold air. They range from power bug to clogged filters, and “dirty compressors”.

Below, we have summarized the 8 about common causes of why air conditioners terminate blowing cold air. Don’t worry. Any problem can exist fixed, even the malfunctioning Ac that’s just blowing non-cooled air.

8 Common Causes Of “Air Conditioner Non Blowing Cold Air”

We have broken down each crusade into 3 sections to help yous out:

  1. What part of AC
    might be causing the “not bravado common cold air” problem.
  2. How to
    check which part of AC
    caused the indoor unit of measurement to not blow cold air.
  3. How to prepare the trouble
    (either DIY or if you lot need to call an HVAC professional person).

In some cases, you can pinpoint the problem yourself with the help of this guide. You might desire to DIY fixing the Ac non blowing cold air yourself, or call an HVAC professional person.

In whatsoever case, knowing a thing or 2 about what causes Air-conditioning units to stop blowing common cold air will enable to you fix the problem or expedite the whole process with an HVAC professional.

We tin categorize the problems that might atomic number 82 to the Ac unit of measurement not blowing cold air into iii categories:

  1. Electricity issues
    (power and thermostat trouble; #1 and #ii).
  2. Clogging issues
    (drains, filters, and ice buildup problems; #three – #5).
  3. Compressor issue; #6.
  4. Airflow switch upshot; #seven.
  5. Low freon levels; #eight.

Yous can check issue one by 1 and run into if you can make the air conditioner blow cold air again:

#one Air conditioning Not Blowing Cold Air Due To Basic Electrical Issues (Blown Fuse, Tripped Breaker)

Allow’south start cover the basics. All air conditioners require access to electricity to prevent them from bravado warm air. If the compressor is not getting adequate power, it would be able to shrink the R410A or R22 refrigerant. The consequence will exist no heat commutation and it will result in the air conditioner blowing same-temperature air.

checking if ac isn't cooling properly due to electricial problems
HVAC professional checking the power wires in the indoor air handler (for mini-split Air-conditioning unit and heat pumps).

Kickoff, bank check the cables. The power cable has to exist correctly plugged into the outlet. Brand certain you’re using the correct voltage. Smaller Air conditioning units (15,000 BTU and below) require 110/120V while bigger units will require 220/240V. Also check if any of the power cables have been damaged.

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“Who doesn’t plug in their air conditioner?”

That’southward the common response. The reason for check the power cables is considering air conditioners require a surge of power when starting and when the rotary compressor starts working at 100%.

Everybody has an air conditioner plugged in. However, when the surge comes, two things can happen:

  1. A fuse is blown.
  2. Amp breaker is tripped.

Information technology’s likely you won’t notice either the blown fuse or 30A breaker tripped. What you are likely to detect is that your air conditioner was blowing cold air and all of a sudden the air conditioner stopped bravado cold air.

To fix basic electric problems that might be causing the trouble, bank check if the fuse is blown or if the amp breaker has been tripped.

Note: Many AC units have protection against farthermost ability surges. They use a congenital-in switch when the system is about to overload. Check if that switch has been flipped. If it has, flip information technology dorsum, and see if the air conditioner started blowing cold air again.

If everything works OK, check the thermostat:

#2 Faulty Thermostat Preventing Air-conditioning Unit From Blowing Cold Air

The thermostat is the fundamental hub for your air conditioners. Thermostat issues can be categorized by difficulty:

  • Bones: Thermostat is not set at adequate (below room temperature) temperature.
  • Intermediate: Thermostat has empty or near depleted batteries.
  • Difficult: The thermostat is non properly wired.

To check if the AC unit is not bravado cold air due to bones thermostat issues, lower the temperature on the thermostat to the minimum (either manually or via remote control). That should produce the
lowest output air temperature
from the indoor air handler; if it’s notwithstanding not cooling properly, yous can check the basic thermostat issue of the list.

Batteries in the thermostat
can too be one reason why AC is non blowing cold air. It might sound basic only batteries in the thermostat tin can be quite fickle; especially when at that place are near depletion levels. Near depletion, the thermostat’s command console can notwithstanding show yous 70°F but the battery simply lacks the energy to communicate that setting to the air conditioner unit adequately. Consider changing the batteries.

A mistake in
thermostat wiring
is ane of the almost problematic causes of the air conditioner not blowing absurd air. This more often than not happens with the newly wired Ac unit. If your brand new air conditioner isn’t bravado cold air, it might not be properly wired, or the wires have non been properly stock-still in thermostat sockets.

wrongly wired thermostat leading to ac not blowing cold air
Instance of the basic 5 wire thermostat.

The reason for the new home central air conditioner not blowing cold air is most often wrongly wired thermostat. To fix information technology, you have to properly wire it. You can consult our guide on how thermostat wiring hither (blue wire is usually for air conditioning and ruby R wire for ability), or consult an HVAC professional to fix the thermostat problem.

#3 Chock-full Bleed Causing Water Builtup And Shutting Down Compressor

Every air conditioner also works as a dehumidifier. Bigger 3+ ton Air-conditioning units can remove more 100 pints of air moisture from your indoor air. All that h2o has to go somewhere.

That’s why air conditioners take drainage systems. The collected h2o is drained via a hose or a piping. If the bleed is chock-full, the
air conditioner will accumulate water. In essence, information technology will be “flooded”.

When that happens, the Air conditioning compressor – the very part responsible for achieving the cooling effect in the cooling coils – might shut down. Mind you, the fan might exist working simply fine. The net issue will be the AC unit running but non cooling.

Fortunately, it’s quite easy to
fix a chock-full AC bleed. You just unclog information technology.

Check where in your Air-conditioning unit the drain piping is located. If y’all see debris, mold, leaves, hair, algae in that piping, make sure to remove it and clean the piping. Utilise household cleaning agents to clean information technology.

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If the drainage pipe is clogged and it’s almost impossible to properly clean it, yous might consider replacing the drain pipe in club to restore the air conditioner’s function.

When the drainage system will work properly again, the water volition be able to bleed out of the Ac unit, the compressor will work properly, and the air conditioner should accident cold air again.

#4 Clogged Filter Switching Off The Motor; Preventing Cooling Coil To Lower Air Temperature

Every ounce of air that the air conditioner outputs take to become through the air filters. That means that the total airflow can be restricted if the filters are clogged. If the airflow is restricted, many Ac parts like compressor, motor, fan, and so forth start to overcompensate to generate more than airflow (to satisfy the thermostat temperature setting).

In short, “muddy filters” might sound like a small matter simply it leads to serious AC issues. That’s why many air conditioners accept a built-in switch that shuts the AC unit downwards if the filters are too clogged. This volition, manifestly, result in the air conditioner not working properly and not delivering the absurd air output.

In some cases, information technology makes sense to make clean the filter. In more cases, the all-time way of activity is merely to replace the clogged filters. MERV five-12 filters used in Air-conditioning units are fairly cheap; yous can get a pack of 6 filters for almost $sixty (depends on your air conditioner, MERV rating, and and so on).

Note: “Dirty filters” might shut off the compressor before the fan. That will lead to your air conditioner not blowing cold air while yet running.

#v Frozen Coils (Ice Buildup) Can Lead To AC Blowing Colder But Not Properly Cold Air

Ice buildup in the air conditioner is actually one of the most frequent issues nosotros face. Basically, the parts in the interior of the AC unit freeze information technology every bit a consequence of a serial of events all started by depression airflow.

Low airflow tin be a consequence of primarily three things:

  1. Chock-full filters (bank check #iv cause). Filters directly reduce the airflow due to less infinite available for cold air to pass through.
  2. Dirty coils. Cleaning the coils helps in this case.
  3. Depression refrigerant levels (cheque #viii cause).

Due to low airflow, the compressor will work actress trying to compensate for the loss of airflow, and parts of AC (primarily the cooling coil) might freeze over. The result is that the air temperature coming from the indoor air handler will be lower but not sufficiently low.

Before, the air was cooled by cooling coils with superb heat-exchange coefficient. Now, at that place is ice covering them, and ice might be cold but information technology has a much lower heat-exchange coefficient than AC cooling coils. Equally a outcome, the air output temperature might be upwards to v°F cooler than room temperature; only that’s not cold plenty in nigh cases.

Irresolute filters or cleaning the dirty coils is useful just information technology won’t fix the issue of the air conditioner blowing not blowing cold air immediately. Beginning, you lot have to deal with the accumulated ice.

To get rid of the ice, but run the air conditioner with the fan on, and the cooling system off. That will cook the accumulated ice and release the cooling coils. Merely after the cooling coils are out of the ice beat out yous can kickoff using the air conditioner properly.

#six Malfunctioning Compressor Due To Dirt Accumulation (Freon Not Fully Compressed)

The compressor is a vital part of whatsoever AC unit. Information technology has ane chore: to compress the refrigerant (R410A, R22, etc.). The compressed refrigerant is expended in the cooling coil which cools it down; this is the basics of how air conditioners piece of work.

If at that place is any malfunction in the compressor, the refrigerant is not compressed fully. This means that the cooling coil will not be as cold equally it should be. The air passing through the coil will not be cooled down plenty which will result in our Ac not blowing the chilly cold air.

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ac running but no cold air due to compressor failure
Faulty compressor will definitely lead to Air-conditioning not blowing cold air but running.

Now, a lot of things tin get wrong with the compressor. By far the simplest one to prepare is the “dirty compressor” problem. Both central air and mini-split Air-conditioning units have a compressor in the outdoor unit. There it is exposed to the elements; including mold, leaves, grass, fifty-fifty some animals.

All these things can dirty up the compressor and reduce its performance. When fundamental Air conditioning isn’t bravado cold air, for case, you can check if everything is OK with your compressor.

The kickoff order of business concern is to go to the outdoor unit, take off the panels, and cheque if there is whatsoever debris effectually the compressor. Y’all might even notice an organic biofilm existence formed effectually the compressor; that is mold and bacteria compromising your compressor.

Any HVAC professional volition first make clean the compressor and see if that volition fix the “no cold air from Ac” issue.

If not, and he or she will have a expert suspicion that it’due south the compressor that’s at error, you will probably take to replace your compressor. Here are some guides on air conditioner compressor replacement costs; they tin can range to $3,000+ in key air units.

In that location are few ways that tin can be avoided; your HVAC professional will know best. Sadly, compressor issues usually require professional assistance. Nosotros can only DIY rough cleaning of the compressor.

#7 Condensate Airflow Switch In Off Position Due To Drainage Failure

This is a less frequent cause of cardinal AC not bravado cold air; information technology might help some homeowners, however. We have already talked about the air conditioner existence “flooded” when there is no adequate drainage. This mainly happens due to chock-full drainpipes.

Some specific air handlers (indoor unit of measurement) take a congenital-in safety switch (“condensate airflow switch”) that turns the cooling off in an event of drainage failure.

You lot tin can cheque if that switch is turned off. That might be the reason for no cold air coming from your air conditioner.

To fix the Air conditioning not blowing cold air problem, just turn the switch back on.

Of course, you’re likewise recommended to investigate if there was any window Ac leakage that switched it off.

#8 Low Freon Levels Can Pb To Air-conditioning Not Getting Cold

Refrigerant is used to facilitate the rut-cold commutation. Without it, no air conditioner can work properly. If your refrigerant is slowly leaking from the refrigerant lines, y’all will start seeing your air conditioner cooling less and less.

On top of that, all other parts of the Air-conditioning unit of measurement tin be at harm. At depression freon levels, both compressor and the motor will start working extra difficult in guild to recoup for the loss of refrigerant.

The only mode to set this is to refuel the freon. You might want to check our guide on how exactly to recharge an air conditioner with refrigerant.

hvac professional recharging refrigerant lines to prevent ac not blowing cold air while running

Circumspection:
Information technology’s best to go out the recharging of freon to HVAC professionals. It’south hard to DIY it. On top of that, you have to first find the leak, and ready it. Otherwise, the added freon will just leak out and you will, in some time, again experience the inadequate temperature of the air coming from the air conditioner.

Need A Professional person Assistance?

These were the nuts of what to look for when trying to solve the problem of air conditioners not blowing common cold air simply running.

For professional help, you tin can consult an HVAC professional in your area. If yous need a fleck of help finding expert vetted professionals, you can fill in this course and you will get some quotes and advice for complimentary.

Source: https://learnmetrics.com/air-conditioner-not-blowing-cold-air/