When your aircon starts misbehaving in Singapore’s heat, the hard part isn’t fixing it — it’s knowing what’s actually wrong, and whether you need a free filter clean, a servicing, or a real repair. This guide runs through the most common symptoms, what’s usually behind each, and which one you actually need — honestly, including the times the answer costs you nothing.

Why is my aircon not cold, or blowing warm air?

The most common complaint of all. Usual causes: a dirty filter choking airflow, dirt built up on the coil, low refrigerant from a leak, or a struggling compressor.

Try first: wash the filter and confirm it’s on Cool at 23–25°C. If cooling is still weak after a clean, the culprit is usually dirt deeper in the unit or low gas. Start with a general servicing — if proper cooling doesn’t return, it points to a gas or mechanical fault that needs a repair.

A real coil from a Singapore home, before and after cleaning — most “weak cooling” is dirt like this, not a fault.

Why is my aircon leaking or dripping water?

Almost always a clogged or dirty drainage pipe — the most common cause in Singapore homes. It can also be a frozen coil melting (from a dirty filter or low gas), or a unit that was installed without the right slope.

If water is dripping onto power points, switch it off. A blocked drain is usually cleared during a general servicing; if it keeps leaking afterwards, the drain or installation needs proper attention from a technician.

Why does my aircon smell musty or sour?

That smell is mould and bacteria living in the damp coil and fan — Singapore’s humidity feeds it. A standard servicing won’t always reach it. A steamwash clears it at the source with high-temperature steam, no chemicals; for a heavily fouled unit, a chemical overhaul is the deeper option.

Why is my aircon making noise?

It depends on the sound. A rattle or buzz is usually a loose panel or trapped debris — often sorted during a servicing. A grinding or screeching points to a worn fan motor or bearing. A hissing or bubbling can mean refrigerant escaping.

Rattles can wait for your next servicing. Grinding and hissing should not — both need a technician before they cause bigger damage.

My aircon light is blinking, or the timer is flashing — what does it mean?

The unit has run a self-check, found a fault, and is flashing a code — often shutting down cooling to protect itself. Sometimes it’s minor: a choked filter or a reset (off at the isolator for 60 seconds) clears it. If it returns, the code is pointing to something real — a sensor, the circuit board, a communication fault between indoor and outdoor units, or gas.

As authorised dealers for Mitsubishi Electric and Daikin, we can read these codes and bring the right part on the first trip. Take a short video of the flashing pattern before you call, then book a repair.

Authorised dealer — we read Mitsubishi Electric, Daikin and Midea fault codes and carry the right parts.

Do I need a repair, a servicing, or a steamwash?

Most of the time the honest answer is the cheaper one. A quick guide:

Not sure? We’ll always tell you if a clean will fix it before quoting a repair.

The technician says I need a gas top-up — do I really?

Aircon refrigerant runs in a sealed loop — it isn’t “used up.” If your unit genuinely needs gas, it’s because there’s a leak. Topping up without sealing the leak just means you’ll pay for it again in a few months. A repeat top-up that “fixes” cooling each time is a red flag, not a solution. The right fix is to find and seal the leak, then recharge. If someone’s pushing regular top-ups, get a second opinion — that’s exactly the kind of honest diagnosis our repair visit is for.

The technician says my compressor is dead — must I replace the whole unit?

Not always. A “dead compressor” is sometimes a failed capacitor, a wiring fault, or a tripped protector — far cheaper, and worth a second opinion before you write off the unit.

It’s also worth knowing how compressor warranties really work: many installers cover only the compressor part, not the labour and materials to fit it — so a “free compressor” can still come with a sizeable bill. When Kim’s installs a unit, compressor replacement covers both labour and materials within your warranty period. See our warranty page for current terms.