Most cases of an aircon not cooling come from a dirty filter, a wrong remote mode, or a tripped breaker — all things you can check yourself before calling a technician. But if you see ice on the unit, the outdoor fan blade not spinning, or oil stains on the pipes, call a technician, since these involve refrigerant, electrical wiring, or the compressor. The site-visit fee is 500 ฿ in Bangkok/nearby provinces and 2,000 ฿ upcountry.
3 things you can check yourself before calling a technician
Before assuming the unit is broken, check these 3 points first — most take only a few minutes and need no tools.
- Dirty filter — Open the indoor unit's panel and check the dust filter. If dust is thick enough to block light, airflow will be weak and not cool. Remove and wash it.
- Wrong remote mode — Confirm the remote is on Cool (snowflake icon), not Fan or Dry, and that the set temperature isn't too high.
- Tripped breaker — If the compressor doesn't run despite the remote showing power, check the aircon breaker and reset it once.
Signs you need a technician
If you notice the following, don't open the unit or handle the refrigerant yourself — these involve electrical wiring and refrigerant and need a technician with specialized skills.
| Sign observed | Likely cause | Who should fix it |
|---|---|---|
| Ice on the indoor coil or pipes | Refrigerant leak or low refrigerant | Technician |
| Outdoor fan blade not spinning at all | Faulty outdoor fan motor or run capacitor | Technician |
| Unusual knocking or whining noise from the compressor | Compressor starting to fail | Technician |
| Oily residue at copper pipe joints | Refrigerant leak point | Technician |
| Musty or burnt smell from the airflow | Mold buildup, or overheating wiring/motor | Technician (turn off the unit immediately if it smells burnt) |
See what a technician checks at F-Fix's aircon repair service
How much does calling a technician cost
The price depends on site conditions and scope — see the latest reference prices on the pricing page.
Prices come from F-Fix's aircon repair price page (last updated July 2026) and aren't final — confirm with an on-site quote.
What to include in your first LINE message
When messaging F-Fix on LINE, include enough detail so the team can assess the issue and match you with the right technician:
- Photos of the unit — remote, indoor unit, outdoor unit, and the affected spot, such as ice buildup or oil stains
- The symptoms — weak cooling, unusual noise, odor, or the outdoor fan blade not spinning
- When the issue started
- Your province/district
- A convenient time for the technician to visit
The team reviews your info before matching a technician, and shares technician details and pricing before work starts — work begins only once you confirm. Repairs carry a 7-day warranty; if the same issue returns within that period, you can report it back. Read more at F-Fix's trust page
In short, an aircon not cooling usually starts simple — the filter, remote mode, or breaker — check these yourself first. But ice buildup, a stalled outdoor coil, unusual noise, or a burnt smell mean it's time to call a technician, since these involve refrigerant, wiring, or the compressor and shouldn't be handled yourself.
Still not cooling, or unsure if it needs a technician? Add F-Fix on LINE and send photos along with the symptoms, when it started, your province/district, and a convenient visit time. The team will review it and share technician info and pricing before you decide. See F-Fix's contact page
Frequently Asked Questions (FAQ)
The aircon isn't cooling but the compressor is still running — why?
Usually a dirty filter or wrong remote mode — check those two first. If it's still not cooling, refrigerant may be low, which needs a technician to check for leaks.
Can I clean the aircon myself without calling a technician?
Basic filter cleaning, yes. But a full pressure-wash of the coil should be done by a technician, since water can damage the circuit board. The price depends on site conditions and scope — see the latest reference prices on the pricing page.
What should I do if ice builds up on the aircon?
Turn off the unit and let the ice melt on its own — don't pry or scrape it off. It's usually a refrigerant leak or shortage, which needs a technician to check for leaks and refill correctly.
What if the aircon still isn't cooling properly after a repair?
Repairs through F-Fix carry a 7-day warranty. If the same issue returns within that period, message the team on LINE for a recheck.