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Aircon leaking water indoors

Indoor leaking usually follows three paths: drain blockage, freeze-thaw behavior, or condensation routing issues. Here is how to read the pattern.

Common causes

These are likely causes for this symptom. Compare them with what you are seeing now to narrow it down. This is indicative only. To confirm the problem, contact us.

01. Drain-path blockage

Low risk

Sludge or biofilm buildup blocks the drain path. Water backs up and drips from the indoor unit.

  • Steady drip pattern during runtime.
  • Gurgling water sound near the indoor unit.
  • Cooling can still feel acceptable at first.

Solution: We clear and flush the drainage path, correct slope or insulation issues where needed, and retest under cooling load to confirm leaking stops.

Remarks: Gas work will not solve a pure drain obstruction pattern. Confirm drain behavior before approving unrelated scope.

02. Freeze-thaw cycle

Book a check

Unstable coil temperature behavior forms ice, then meltwater releases in bursts instead of a steady drip.

  • Leak appears in bursts, not a constant flow.
  • Cooling weakens before leakage worsens.
  • Icing signs may appear near the indoor area.

Solution: We remove the root restriction causing freeze-up, restore airflow or refrigerant balance as needed, and retest for stable operation without icing.

Remarks: Treating every leak as a simple drain issue can miss the freeze trigger and lead to repeat leakage.

03. Condensation routing or slope issue

Book a check

Condensation travels incorrectly when routing geometry or insulation conditions are off, creating hidden drips.

  • Drip location shifts along trunking or wall path.
  • Leak timing changes with weather or runtime.
  • Moisture appears even when cooling output seems normal.

Solution: We clear and flush the drainage path, correct slope or insulation issues where needed, and retest under cooling load to confirm leaking stops.

Remarks: Replacing major components without confirming water-path behavior can add cost without solving recurrence.

Other possible causes

Water can travel from nearby wall or ceiling pathways and appear near the indoor unit, especially during monsoon periods. This can mimic an aircon leak even when the drain path is still functioning.

How to tell

  • Water appears mostly after heavy rain, even with short runtime.
  • Leak marks spread along wall or ceiling lines before reaching the FCU area.
  • Moisture location shifts over time instead of staying at one fixed drip point.

If this is the case we will tell you on-site before recommending any aircon repair.

Before you contact us (optional)

Just observe, no disassembly required:

  • Leak pattern: steady drip / burst / light seepage
  • Timing: startup / mid-cycle / shutdown / after rain
  • Cooling trend: unchanged / weaker / unstable
  • Moisture location: under unit / trunking edge / wall line / ceiling line

Stop using the unit if you notice these

These are not routine leak faults. These are safety issues.

  • Water near sockets, plugs, or exposed wiring
  • Breaker tripping while leakage is active
  • Burning smell during leakage events
  • Water reaching sensitive equipment or appliances

Common questions

Same situation with your aircon?

Describe what's happening. We'll work out the likely cause and tell you the right next step.

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