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Aircon Problem Super Guide: 25 Common Faults Explained

  • thesnowflakesg
  • Feb 2, 2022
  • 4 min read

Updated: 3 days ago

Aircon acting up? Not cold, leaking water, strange smells, loud noise, or flashing errors?


This guide helps you understand what your system is actually telling you — before you waste money on the wrong fix.


It’s not a DIY repair manual. It’s a field-tested breakdown of 25 common faults we’ve seen across thousands of visits — in homes, offices, clinics, and shops.


Your system is sending a signal.

Start here, and know what to do next.


Cooling & Airflow Failures

1. Not cold / airflow weak

2. Recently serviced, still not cold

3. Only some rooms are cooling (multi-split)

4. Feels cold, but room still warm

5. Room never reaches set temperature


Leaks, Moisture & Drainage

6. Water leaking from indoor unit

7. Water backing out from drain pipe

8. Leak only happens after shutdown

9. Condensation on trunking or wall

10. Wall wet near piping


Smell, Mold & Hygiene Signals

11. Musty smell after cooling stops

12. Smell during use (musty, sour, burnt)

13. Smell is clean, but airflow is weak

14. Burning smell on startup


Noise & Outdoor Unit Behaviour

15. Indoor unit rattling or vibrating

16. Grinding or buzzing noises

17. Outdoor unit louder than usual

18. Humming, but no cooling


Controls, Errors & Communication Faults

19. Blinking lights or flashing error code

20. Remote not working despite battery change

21. Unit turns on and off repeatedly

22. Room temperature reading seems off


Startup & Electrical Failures

23. Unit won’t power on

24. Turns on, but no airflow

25. Starts, then shuts off after a few minutes


Need aircon help?

Whether it's cooling issues, leaks, noise, or weak airflow — we diagnose first before recommending any fix. No guesswork. No pressure. Just proper checks and real solutions.



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