Your aircon is running but the room stays warm. Here is how to read the pattern, what usually causes it, and what we check before touching anything.
Note your answers to these three questions. They take 30 seconds and will point you to the right fault path.
Most common · Usually minor
Your filter is probably clogged. Cold air cannot reach the room even though the unit is running normally.
Watch out: If someone recommends gas top-up before checking airflow, push back. Both faults feel identical from where you sit. Airflow check costs nothing. Gas top-up without a leak check is money spent on a symptom.
Gradual worsening · Needs diagnosis
A leak is causing refrigerant to drop slowly. The unit blows air but there is not enough refrigerant to cool it. Airflow feels normal, and that is what separates this from blocked airflow.
Watch out: Repeated top-ups without fixing the leak will cost you repeatedly. The refrigerant drops again. The leak must be found and sealed first.
Least common · Usually sudden · Needs diagnosis
The compressor cannot start or hold load. Air still blows but no real cooling happens.
Watch out: Compressor replacement is a major job. A smaller start component is sometimes the actual trigger. Confirm root cause before approving major work.
West-facing rooms in the afternoon, doors opening frequently, curtains open, and appliances running. These push heat in faster than a standard unit can remove it. The aircon is working fine.
If this is the case we will tell you on-site. No repair needed.
| Finding | Next Step |
|---|---|
| Airflow weak, filter clogged | Clean or replace filter, retest |
| Airflow normal, cooling fading gradually | Leak check before any gas top-up |
| Outdoor unit unstable, sudden onset | Compressor and start component check |
| Unit working normally, room heat load high | No repair needed, we advise on room factors |
| Results unclear on first check | Retest under normal running conditions |
No disassembly needed. Just observe:
The more specific you are, the faster we point you to one next step.
These are not cooling faults. These are safety issues.