Condo dripping after renovation: fine dust choked the drain

A Paya Lebar condo unit started dripping after renovation works in the home. The timing pointed to dust entering the drain path, so the drain line was checked before quoting tray replacement or deeper aircon work.

By Team Snowflake | Updated 28 Jul 2026

Case summary

Panasonic Wall-mounted5 years oldCondoPaya Lebar, Singapore

Concern: Water appearing only after the works ended suggested a damaged indoor tray to the owner.
Found: Fine renovation dust choking the drain path
Key check: Checked the drain line after renovation dust exposure
Result: The dripping stopped after the drain choke was cleared. The repair stayed small and tied directly to the renovation dust exposure. The owner had a clear follow-up trigger: recheck the drain path after dusty works, before boxing up access or installing furniture.

What we were told

The bedroom unit had not leaked before renovation. After painting and carpentry work, water began appearing at the trunking and lower casing. The area had been wiped dry, but the drip returned whenever the unit ran for a longer session.

What we checked

Because the leak started after dusty works, we did not begin with tray replacement. We checked whether water was being produced normally, whether the drain pan was cracked, and whether the drain path could clear water. The renovation context made fine dust and sludge the most likely early suspects.

The drain pan was intact at the visible leak area.
Water pooled instead of leaving the drain line smoothly.
Fine grey dust and sludge were present in the drain path.
The leak appeared after longer runtime, not immediately at start-up.

What we found

Fine renovation dust had entered the drain path and mixed with moisture to form a choke. The aircon was still producing condensate normally, but the water could not clear fast enough. Once the drain backed up, water escaped at the casing and trunking. The fault looked like a damaged indoor unit, but the actual issue was a blocked water route caused by post-renovation dust. The fact that the leak returned only after longer runtime also matched a slow drain restriction, not a tray that was open from the start.

What fixed it

We cleared the drain line, flushed the path, and checked that water flowed out consistently before closing the unit. The owner was advised to run and observe the aircon after dusty works rather than waiting until furniture is fully installed around the trunking. The tray stayed in place, because the dust had choked the line rather than damaging the tray itself. We also suggested a post-renovation cleaning check before regular use, especially if sanding or carpentry dust was heavy.

Outcome

The dripping stopped after the drain choke was cleared. The repair stayed small and tied directly to the renovation dust exposure. The owner had a clear follow-up trigger: recheck the drain path after dusty works, before boxing up access or installing furniture.

What this case teaches us

Post-renovation drips need the drain path checked

Fine renovation dust can mix with drain water and form a choke. The unit may be healthy but unable to clear condensate.
A leak that starts after dusty works should be diagnosed from the drain path before tray or coil replacement is discussed.
Tell the technician what was hacked, sanded, or painted nearby. That context changes the first inspection.

Questions this case answers

Aircon started leaking after home renovation: what usually causes it?

Fine dust in the drain path. In this Paya Lebar condo the drain pan was intact at the visible leak area, but water pooled instead of leaving the line, and grey dust and sludge were sitting in the route. Painting and carpentry work had put enough airborne dust into the unit to form a choke.

The leak only shows after a long cooling session. What does that tell you?

A restricted drain still passes water slowly, so a short session clears itself. Longer runs produce condensate faster than the choke lets through, and the backed-up water escapes at the casing and trunking. That delay was one of the reasons the tray was not the likely culprit here.

Should the indoor tray be replaced when water appears after works?

Not before the drain path is checked. The tray in this flat had not failed, and replacing it would have left the blockage in place along with the leak. Clearing and flushing the line, then confirming water flowed out consistently, kept the job matched to what the inspection actually found.

Before boxing up the aircon area after renovation, what needs checking?

Run the unit and watch it. Sanding, hacking and carpentry dust reaches places nobody expects, and it is far easier to clear a drain before furniture and joinery close off the trunking. Mentioning what was hacked, sanded or painted nearby also changes where a technician starts looking.

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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.

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