8 possible reasons behind AC not cooling properly

Air conditioner not cooling

What you least want on a hot summer day is an air conditioner that can’t cool. There can be several reasons behind AC not cooling problem, some of which are technical faults and some are non- technical.

Most common reasons behind AC not cooling are:

Clogged air filter

If the air conditioner does not cool, the air filter might be clogged. In such case, air cannot flow through properly which greatly reduces the cooling capacity of the air conditioner. Either clean the air filter or replace it as needed.

Dirty coils

If the air conditioner is not cold enough the condenser coils may be dirty and loaded with debris. In an AC, the condenser is like a radiator that dissipates heat (which was removed from the air). The condenser coil must be clean to dissipate heat outside. As the coils get dirtier the air conditioner becomes less efficient, which makes it work harder to cool the room. If the coils are dirty enough, the unit will never be cold enough and will not be able to cool the room.

Insufficient coolant

The coolant circulates through the evaporator coils and cools the air flowing over it and eventually sends cool air into the room. So when the level of this coolant becomes insufficient, the AC fails to cool. At this stage call a PRO for coolant top up and refill.

Faulty compressor

A compressor is the heart of an air conditioning unit which is responsible for cooling your room. If the air conditioner does not cool, the compressor might be defective. The compressor is a motor which compresses the refrigerant or coolant and circulates the refrigerant through the evaporator and condenser coils. If the compressor goes bad the cooling cycle does not start and the AC fails to cool.

READ ALSO:  Top Samsung split air conditioner prices & specs

Faulty thermostat

A thermostat is a sensor that senses the room temperature and hints the compressor to start or stop the cooling cycle. If the thermostat is defective the air conditioner does not cool or may cool continuously.

Defective parts

The other possible technical reasons behind AC not cooling can be a faulty run capacitor of the compressor, defective control board, bad thermistor, choked capillary, faulty motor etc.

High atmospheric temperature

An AC has an optimum operating temperature (surrounding temperature) at which it can work most effectively. If the temperature shoots up beyond the optimum temperature limit, the efficiency of the air conditioner goes down. Sometime it is so hot outside that a stage is reached where the compressor stops working completely.

Undersized AC

A common mistake people make is that they buy an AC based on their budget and not based on the requirement of the room. A small AC in a huge room will always find hard to cool the room in peak summers. The size of the AC should be according to the size of the room.

Faulty AC Remote

There can also be a situation when the remote fails to send temperature change signals to AC unit. A simple replacement of remote will do the trick. Here, are a few Brand specific AC remotes and a universal remote that you can get on Amazon via reputed sellers:

Recommendations for saving AC Electricity Consumption

If you enjoy the cool air from your AC but are sweated at the end of the month after seeing your electricity bills, then there is a robust system that can help you save a huge amount of money and power savings over a long period of time. Check out this AC Module that helps run all your heavy duty home appliances for more than 25 years.

READ ALSO:  How to install a split air conditioner?

Other than that, if your AC is not cooling, you can always book a case with Mr Right.

For more information on AC care and maintenance refer to Ideas by Mr Right

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46 Comments

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    Daikin inverter split unit.
    Suddenly it is not cool. Inside blower runs as normal. Faulty code got no irregular code external unit fan stop functioning. External circuit boatd green like blinking as normal.

    Checked fan motor no faulty.
    Checked indoor sensor , normal
    It runs about two hour cooling then start losing it cool. During which the fan stop again.

    What could likely be the cause?

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    Kuwait فني تكييف has the honor to provide all air conditioning repair and maintenance services in all regions and governorates of the beloved state of Kuwait, and one of our most important services is Kuwait air conditioning technician,

  5. 5

    Voltas inverter AC 1.5 ton…
    Compressor supply cut off automatically after few minutes of run. Results in non cooling, then automatically again compressor starts running.

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    I have a old Voltas AC, now its not cooling down, but I mantained it frequently, Can you give me a solution how to repair it?

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    I have a 1HP air conditioner in one small room but the A/c never cool only bring out breeze some time with a very low cool sometimes hot breeze i have contacted 3 a/c engineer they keep collecting money for gas feeling after which my a/c will not still cool am just tired of every thing please what can i do?

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    Yesterday, I got home from vacation and tried to turn on the ac. Unfortunately, for some reason, it isn’t working. Thank you for informing me that without coolant the ac will fail to cool. I will have to look into professionals that could help me repair or replace my ac.

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