My air conditioner does not cool, why?

Previously we talked about the possible causes for the  air conditioning not working  or not heating , now we are going to see the possible reasons why the air conditioning does not cool.

Generally when we see that the air conditioning does not cool we tend to think that the problem lies in the lack of gas, we mistakenly think that the gas in an air conditioning must be changed, replaced or recharged every X time and this thought is quite incorrect since if it The installation of the air conditioning is well done and no pipes have been broken due to friction, vibrations, etc., the gas should not be lost and it can remain inside the machine and the installation for years and years, exhausting before the estimated duration of a unit (about 15 years) than having to recharge the gas.

Now, we are going to see the possible causes of why the air conditioning cools little or does not cool at all.

Possible causes of the air conditioner not cooling

Gas leak

As we said before, the possible gas leak is one of the possibilities why the window air conditioner does not cool, although it is equally valid for split or duct air conditioners , the gas leak can be or found in 3 parts of our air conditioning, in the refrigeration installation (copper pipes and connections / welds), in the outdoor unit or in the indoor unit, the first being the most common for units that have been installed for a short time and the last two for units that have been installed more time.

If you think that your machine may have a lack or leak of gas because the air conditioning does not cool, it only ventilates or it does not cool enough , surely you are interested in reading these articles.

Dirty filters, one of the big reasons why my air conditioner does not cool

Another problem because the air conditioning does not cool can be due to the fact that we have very dirty indoor unit filters , many people forget that keeping clean filters is essential not only for the correct operation of the unit, but also to reduce the consumption, do not force the operation of the machine and maintain a cleaner environment since these are responsible for filtering the air in our home.

Dirty filters can make your air conditioner not cool

Dirty filters can cause the air conditioner to not cool

Extremely dirty filters can cause the indoor unit to freeze and may lead to dripping problems in the indoor unit.

Here we explain how and the reasons to clean the air conditioning filters

Dirty indoor fan

We have just talked about the filters and that we have to keep them clean so that our air conditioning works perfectly, this is something that anyone can do without much problem and it really is one of the few things we must do to maintain our air conditioning equipment, however Another problem, although much less common, is the accumulation of dirt on the fan (impeller) of the indoor unit, this problem usually occurs with much more virulence in cold-only units and less in heat pump units, it is also more common in smoking environments, factories or places where sprays such as lacquers or paints are used since they help fix the dirt, this cleaning is a very easy way Fix an air conditioning that does not cool if you forget to do it, since it may be that your problem if your air cools little.

Dirty indoor or outdoor heat exchanger

If we have talked about the importance of maintaining clean filters in our air conditioning for its correct operation, it is equally or more important to keep the exchangers clean, since it is as its name indicates where the exchange of cold or heat takes place and is a fundamental part of our air conditioning equipment, all window , split or duct air conditioning units have two heat exchangers, one inside (indoor heat exchanger) and the other outside (outdoor heat exchanger), although in window air conditioning units it may seem that not when the two are together in the same unit.

Exchanger cleaning

Exchanger cleaning

The exchanger of the indoor unit is just behind the air filters and they are responsible for preventing it from getting dirty easily, this is one of the most important reasons to  keep these filters clean, to prevent that dirt from passing through to the exchanger and can get dirty or clogged as cleaning these components is quite laborious and expensive, cleaning the filters regularly will help enormously to keep the exchangers in good condition.

A very dirty indoor exchanger will have the same effect as very dirty filters, it will lower gas pressure, lower electricity consumption and can freeze the indoor unit, this in turn will cause the air conditioning to cool little .

On the other hand, the exchanger of the outdoor unit will be in charge of “expelling” the heat to the outside and if it is dirty it will prevent this heat discharge from occurring, this in turn will cause the unit to rise in pressure increasing with It causes the consumption, noise and forcing the operation of the machine , even stopping the unit due to high pressure if it is extremely dirty and therefore producing a gradual loss of performance and that the air conditioning does not cool enough or ventilate.

To clean these exchangers you can use a soft bristle brush very carefully, avoiding at all times bending the aluminum sheets that form it, since the air must pass between them, it is advisable in any case to do it with the unit stopped.

Start capacitors

The starting capacitor is in charge of giving the necessary current to the motors of our air conditioning equipment so that they can start, generally these units have 3 motors, the outdoor fan motor, the indoor fan motor and the compressor and 2 or 3 capacitors.

Currently , inverter air conditioners come with capacitors integrated in complex electronic boards , so it is impossible to replace these capacitors without having to replace the entire electronic board, but fixed units or not inverter this component if it is usually separately in the outdoor unit but not so much on the indoor unit.

Compressor start capacitor

Compressor start capacitor

What evidence do we have to think that the capacitor is not working?

We can think that a condenser fails, either the fan or the compressor when everything works, except the fan or the compressor and this can be verified quite easily, for this we will turn on the unit cold and at a minimum temperature, to make sure that the machine It will start up and we will go to the outdoor unit, once there it is still necessary to wait about 3 minutes since many machines have a start delay , after that time several things can happen:

  • That only the fan starts , we can see this because the fan will rotate but we will not hear the noise of the compressor, which is usually a more serious and deeper noise , in this case the indoor unit will not throw any cold and therefore our air conditioning will not It cools only ventilates, if we notice this in our air conditioner it is very possible that the condenser fails, another option would be that the compressor or the electronic board fail.
  • That only the compressor starts , it is easier to see here, because we will hear a noise and we will not see anything “move” . If this happens to you, the fault may be the fan capacitor, the fan itself and also the electronic board or some component of the same (like a relay), the symptoms in the indoor unit will be that the machine gets to throw some cold but little by little it will stop throwing cold since the outdoor unit will not be able to “take off” the heat.
  • That nothing starts , several things can happen here, the condenser may fail and this is common for the compressor and the fan (it is very rare that they share it) or that another component that drives the two motors fails. In this case the indoor unit will not cool anything.

Outdoor fan blocked

As was the case with the failure of the outdoor fan start capacitor, another possibility that exists is that you have the outdoor fan blocked by some object and do not allow it to rotate, thus preventing the machine from detaching itself from the heat it is generating and therefore Whether it stops due to high gas pressure or too high compressor discharge temperature , check that the fan turns correctly and make sure that there is nothing to interfere with this, there are times when the birds fill a large part of the outdoor unit of sticks, herbs and twigs to make a nest and this can make it difficult for the fan to rotate.

In this breakdown, if we cannot see the outdoor unit and to know if this is the possible breakdown, if we look closely, we will see that the air conditioning cools little and less and less as the minutes go by, until the time comes for the outdoor unit it will stop and it will stop cooling to only ventilate.

Other possible faults because my air conditioner does not cool or does not cool enough

As we have seen, these are some of the failures or causes why an air conditioner  does not cool but not the only ones, with the proliferation of inverter air conditioners many of the equipment failures are related to electronic boards making it quite difficult for someone Those who do not have the necessary training can determine and repair the fault, so it is always advisable to contact the official technical service to find out and solve the problem since the current units in their electronic part have become quite complex.