Table of Contents
- Why is the Aircon Not Cooling? (Complete Troubleshooting Guide)
Why is the Aircon Not Cooling? (Complete Troubleshooting Guide)
One of the most common problems homeowners face is an air conditioner that runs but doesn't cool.
Many people immediately assume that there is a lack of freon, but in reality, this is not the most common cause. In most cases, the problem is simpler and easier to fix.
In this guide, we'll break down the possible reasons why your air conditioner isn't cooling, along with practical solutions and when you should call a technician.
First Question: Is the Aircon working?
Before you troubleshoot, it's important to know what kind of problem you have.
If the unit is running but there is no cold, that is a different issue than an air conditioner that is not actually turning on.
In this article, we will focus on the scenario:
The air conditioner is working but it is weak or not cold enough.
Most Common Reasons Why the Air Conditioner Isn't Cooling
Dirty Air Filter
This is the most common and most overlooked problem.
When the air filter is clogged, air cannot flow properly inside the unit.
This results in:
- Poor airflow
- The foam is not cold.
- The air conditioner is having a harder time cooling.
Solution:
Clean the air filter every 2 to 4 weeks if used heavily.
If the unit hasn't been cleaned in a while, it's best to have a general cleaning done.
For the correct schedule, read this too:
Dirty Evaporator Coil
Even if the filter is clean, if the coil is dirty, the air conditioner's performance will still decrease.
The evaporator coil absorbs heat from the air. When it is dirty, it cannot do its job properly.
Result:
- The room took a long time to cool down.
- Set temperature not reached
Solution:
Professional cleaning or chemical cleaning is required depending on the dirtiness of the unit.
Aircon HP is Wrong for Room Size
This is one of the biggest reasons that goes unnoticed.
Even if the air conditioner is new, if the HP is small for the size of the room, it won't really cool properly.
For example:
- 1.0 HP for a large living room → insufficient
- 1.5 HP for a small room → ok
Solution:
Make sure the HP is correct based on the room size.
If you're not sure, check this guide:
Freon Leak or Low Refrigerant
This is one of the most well-known reasons, but it is not an immediate issue.
Freon does not run out if there is no leak.
When there is a leak:
- The cold is mild.
- Sometimes there is ice in the unit
- Cooling is unstable
Solution:
Technician needed for:
- Check for leaks
- Repair
- Recharge freon
How Do You Know If Your Air Conditioner Is Low or Out of Freon?
Read here:
Dirty Condenser Unit (Outdoor Unit)
If your air conditioner is a split type, the outdoor unit is also important.
When the condenser is dirty:
- Heat is not released.
- Cooling is not efficient
Result :
The cold is weak even though the blower is strong.
Solution:
Regular cleaning of the outdoor unit, especially if exposed to dust.
For more information about the Condenser unit, read the article below.
Faulty Thermostat
The thermostat controls when the compressor turns on and off.
When it is broken:
- The temperature reading is incorrect.
- Cooling is inconsistent
Solution:
Needs to be checked and replaced if defective.
Electrical Issues or Capacitor Problems
If the compressor is running poorly or not at full power:
This is a possible electrical issue.
Result:
- Running but not cold
- Not compressing properly
Solution:
Professional diagnosis is needed.
Incorrect Installation
Even if the air conditioner is brand new, if it is installed incorrectly:
Cooling will not be efficient.
Examples:
- Wrong angle
- Poor piping
- Sealing is not done properly.
Solution:
Arrange the installation and make sure it was done by a trained technician.
For this, also read:
Step-by-Step Troubleshooting (Simple to Advanced)
You can follow this before calling a technician:
- Check if the filter is clean.
- Check if the remote settings are correct.
- Check if the room is closed (doors/windows)
- Check airflow if strong or weak
If everything is ok but it still doesn't cool down:
Time to call a technician.
When Should You Call a Technician?
Check if:
- It still doesn't cool down even though it's clean.
- The unit has ice.
- There is running water.
- There is an unusual noise.
- Electric bill suddenly increased
Quick Summary
Common Causes
- Dirty filter
- Dirty coil
- Wrong HP
- Freon leak
- Dirty condenser
- Installation issues
Quick Fix Guide
| Problem | Possible Solution |
|---|---|
| Poor airflow | Clean filter |
| Not cold | Check coil or HP |
| There is ice. | Possible freon issue |
| Noisy | Check installation |
| High bill | Check usage and maintenance |
Common Mistakes of Homeowners
The most common mistake is immediately adding freon even if you are not sure what the problem is.
Result:
Additional costs
The issue is still not resolved.
A correct diagnosis is more important.
Related Guides
To better understand your air conditioner:
FAQs
Why is the air conditioner running but not cooling?
Usually due to a dirty filter, incorrect HP, or maintenance issue.
When does freon need to be refilled?
When there is a leak or the refrigerant is confirmed to be low.
Can cleaning be done DIY?
Basic cleaning is okay, but when it comes to deep cleaning, a technician is needed.
How much does it cost to repair an air conditioner?
It depends on the damage, but maintenance is cheaper than repair.
Conclusion
Freon is not the reason why the air conditioner is not cooling.
In most cases, the problem is simple, such as a dirty filter or lack of maintenance.
If you want to avoid costs, regular cleaning and proper use are more important.
Final Advice
Don't panic immediately if the air conditioner isn't cooling.
Check the basic issues first before spending money on repairs.
But if you're not sure, it's better to see a technician to avoid bigger problems.
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