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:

1. 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.

Here’s some Air Filters that acts as Air Purifiers as well available online:

  1. Nirvana Being Nanotech Split (Wall-Mounted) AC Filter
  2. 3M AC Filters for converting Split AC into air Purifier [Dust, Pollen & Allergens, 4 Sheets, 2 Change Indicators]
  3. 3M AC Filters for converting Split AC into air Purifier [Dust & Pollen, 4 Sheets, 2 Change Indicators] 
  4. 3M Anti Pollution Filter for Converting AC into Air Purifier

2. 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.

If you wish to clean DIY, we have some recommendations for you:-

  1. Heebo Air Conditioning Cleaner & Purifier 450 ML: Pack of 2 
  2. Stainless Steel Fin Comb Brush for AC Blade Radiator Cooling Straightening Cleaning Tool 
  3. Real Life Solution Plastic AC Fin Comb Set, Straightener, Cleaner, Condenser, Evaporator, Cleaning Tool (Blue)
  4. KetZeal Plastic Cleaning Tool Kit Wire Brushes with Brass, Nylon, Stainless Steel Bristles (Set of 3)

To avoid dirt and mess while cleaning your AC Coils please consider these recommendations:-

  1. Real Life Solution Split AC Wash Bag, Service Cleaning Cover, Servicing Kit with Apron (Black)
  2. Stylista Split AC Service Wash Bag Cover Jacket Waterproof 
  3. Split AC Wash Bag, Service Cleaning Cover 

3. 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.

4. 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.

5. 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.

READ ALSO:  5 Steps for installing a window AC correctly

6. 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.

Some of the commonly used Spare Parts you can get online:-

Capacitors

  1. REAL LIFE SOLUTION 50 uf/MFD 370-440 VAC Volts Round Dual Run Capacitor 50/60 Hz AC Electric
  2. Litost Li Capacitor for Air Conditioner AC 440Volt 50/60 Hz 50+6 MFD +-5% Heavy Duty (Match & Buy)
  3. Concap 50 + 2 MFD Dual Capacitor for Conditioner 
  4. Concap 45 MFD Capacitor for Air Conditioner 

Indoor Fan Motor

  1. Rexnord 5 W 8313-05 A2 Fan Motor
  2. Raptor Air Conditioner Motor 16 Watt 1200 RPM Indoor Unit RA 

Outdoor Fan Motor

  1. Raptor Air Conditioner Motor 55 watt 900 RPM Outdoor Unit RA 705 
  2. Raptor Air Conditioner Motor 63 watt 1150 RPM Outdoor Unit RA 
  3. Raptor Air Conditioner Motor 118 watt 930 RPM Window Unit RA 262 
  4. Air Conditioner Motor 93 watt 1050 RPM Outdoor Unit RA 203 

7. 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.

8. 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.

9. 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:

  1. Remote Compatible for Samsung AC Remote(White) 
  2. Remote Compatible for Voltas Smart Split Ac Remote Control with WiFi Function
  3. Remote Compatible for O General Split AC
  4. Remote Compatible for VOLTAS/Onida/GREE/ELECTROLUX/GODREJ AC 
  5. Upix® AC Remote No. 68 with Backlight & Timer, Compatible with Hitachi AC 

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.

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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52 Comments

  1. 1

    In summer AC has become the necessity now a days. If it does not work properly then it becomes very difficult to survive in heating summer days. This article help us for various reasons and to rectify when the ac does not work properly. Also the electricity bill is too high in summers. Solar systems can help us to save our electricity bill. We can count on Roop Solar for best solar system in India. We are leading solar panels and solar system dealers in India.

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    My sharp split AC of 1.5 ton is not cooling last few days.can u give me the right direction. My email is : bimal_ kolay@ yahoo.co.in.

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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?

  10. 10

    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,

  11. 11

    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.

  12. 12

    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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