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Aircon Troubleshooting · Singapore

Why Is My Aircon Leaking Water?

Water dripping from the indoor unit is almost always a blocked drainage path — or a frozen coil melting faster than it can drain. Here’s how to tell which, and what to do right now.

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The short answer

Aircon makes condensation, which drains away through a pipe. When that pipe or the drainage tray is clogged, water overflows from the indoor unit — the #1 cause. A frozen coil melting, a dirty blower, or a failed drain pump are the other culprits. Turn the unit off to avoid water damage while you arrange a fix.

Common causes — and the fix for each

From most to least common in Singapore homes.

Blocked drainage tray or pipe

The most common cause. Dust, mould, and algae build up in the drain tray and pipe until condensation can’t flow out — so it overflows from the indoor unit instead. Singapore’s humidity makes this build up fast.

Chemical wash from $110

Frozen coil melting

Low refrigerant or poor airflow can ice up the evaporator coil. When the ice melts, it drips faster than the tray can drain. Often paired with weak cooling.

Gas top-up from $80

Dirty blower wheel and coil

A grimy blower flings condensation off-course instead of into the tray. A deep clean of the internal components stops the splashing.

Chemical wash from $110

Faulty drain pump or pipe slope

If the drainage pump has failed, or the pipe was installed without enough downward slope, water can’t move out — a fault that needs repair or re-piping.

Aircon repair from $50

What to do right now

Steps to limit damage before a technician arrives.

  • 1Switch the unit off at the wall to stop further dripping and protect the electrics.
  • 2Place a towel or basin under the leak to catch water and prevent floor or ceiling damage.
  • 3Clear the outdoor drain pipe outlet of any visible leaves, dust, or debris.
  • 4Remove and rinse the washable filter — a clogged filter worsens condensation overflow.

When to call a technician

The clog is usually deep in the drainage tray and pipe, where it has to be flushed or vacuumed out — not something you can reach from outside. If the leak is from a frozen coil or a failed pump, that’s refrigerant and mechanical work that needs proper tools.

We clear the blockage, deep-clean the drainage path, and confirm the unit drains properly before we leave — usually same day, with the price agreed up front. Servicing across Singapore from $45.

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Aircon leaking water — FAQs

Why is my aircon leaking water from the indoor unit?
As an aircon cools, it pulls moisture out of the air, which should drain away through a pipe. When the drainage tray or pipe is clogged with dust, mould, or algae, the water has nowhere to go and overflows from the front of the indoor unit. A blocked drain is the most common cause by far.
Is it safe to use my aircon while it is leaking?
Turn it off. Dripping water can damage your ceiling, walls, and flooring, and can reach the unit’s electrical parts. Switch it off at the wall, place a towel or basin to catch drips, and book a technician — running it while it leaks only risks more damage.
How much does it cost to fix a leaking aircon?
A chemical wash that clears the drainage and coil starts from $110 per unit. If it’s a frozen coil from low refrigerant, a gas top-up starts from $80. If the drainage pump or pipe slope needs work, repair starts from $50 for diagnosis. We confirm the price on-site.
Can I clear the aircon drainage myself?
You can clear the visible outdoor drain outlet of leaves or debris, and clean the filter. But the clog is usually deep inside the drainage tray and pipe, which needs to be flushed or vacuumed out properly — that’s part of a chemical wash or servicing.

Leaking aircon? Let’s stop it today.

Same-day diagnosis across Singapore. Transparent pricing — you know the cost before we start.

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