Aircon Water Leaking in HDB and Condo Homes: Causes, Fixes and Costs in Singapore

Aircon water leaking is the fastest-escalating aircon problem in Singapore homes. A fan coil that drips overnight can stain a feature wall, soak a mattress, lift laminate flooring and, in a condo, land you in a dispute with the unit below. The good news: the overwhelming majority of aircon water leaking cases in HDB flats and condominiums come down to drainage, not refrigerant, and drainage problems are cheap to fix if you act early. This guide covers the nine causes, the emergency response, the checks you can do yourself, and what aircon repair actually costs.

First ten minutes: what to do when your aircon leaks water

1. Switch the aircon off at the remote and at the isolator or breaker. Water and electronics do not mix, and continued running keeps producing condensate.
2. Place a towel and a basin under the fan coil. Protect flooring and any furniture below.
3. Move electricals and soft furnishings out from under the unit - power strips, bedside lamps, mattresses.
4. Wipe the wall dry to limit staining and mould on paint.
5. Photograph the drip point - the exact corner water emerges from tells the technician a lot.
6. Do not poke into the unit with wire or a stick. Fins bend easily and a punctured drain pan turns a $60 job into a $100 overhaul or worse.
7. WhatsApp Uncle 7 Aircon at 9431 1589 with your postal code and the photo. We book from 9am daily and confirm a flat price up front.

Why aircon water leaking happens at all

An air conditioner dehumidifies as it cools. Warm humid Singapore air passes over a coil that is well below dew point, moisture condenses on the fins, runs down into the drain pan, and flows by gravity through a drain pipe to the outside. A single fan coil can produce several litres of condensate on a humid night. Anything that interrupts that path - a blockage, a bad slope, a full pan, a cracked pan - sends the water where you do not want it.

Cause 1: Blocked condensate drain pipe

This is the number one cause in Singapore. Dust that escapes the filter mixes with condensate, forms sludge, and combines with algae and biofilm to plug the drain line. Water backs up, overflows the pan and drips from the fan coil, usually at one corner. The fix is a proper drain vacuum and flush during general aircon servicing, or during a chemical wash if the coil is also fouled. If your drain has never been vacuumed, this is almost certainly your problem.

Cause 2: Silted or dirty drain pan

Even after the pipe is cleared, a pan caked with sludge holds water and overflows on the next humid night. General aircon servicing clears loose debris; a hardened layer needs an aircon chemical overhaul at $100 per unit, where the pan is removed and scrubbed to bare plastic.

Cause 3: Dirty evaporator coil

When fins are matted with dust, condensate no longer runs down cleanly. Instead it clings to the dirt, forms droplets in the airstream and gets blown out of the vent - which is why some households see spitting or misting rather than a steady drip. An aircon chemical wash at $60 for one unit usually cures this permanently.

Cause 4: Frozen coil that thaws

If the coil ices up from restricted airflow or low refrigerant, the ice eventually melts faster than the pan can drain and water sheets over the edge. The tell-tale sign is heavy leaking shortly after switching the unit off. Fixing the leak means fixing the freezing: clean the filters and coil, and get a $40 diagnostic if ice returns.

Cause 5: Drain pipe slope or installation faults

Condensate drains by gravity alone. If the drain pipe sags between hangers, runs uphill for part of its length, or has too many tight bends, water pools inside and eventually backs up. This is an installation defect, common where trunking has been extended during renovation or where a fan coil was relocated. The fix is re-supporting or re-routing the pipe - not repeated cleaning.

Cause 6: Loose or disconnected drain hose

The flexible hose from the pan to the main drain can slip off its spigot, especially if the unit has been dismounted for an overhaul or knocked during renovation. The symptom is dramatic: a lot of water, fast, straight down the wall behind the unit.

Cause 7: Cracked drain pan

Old plastic gets brittle, and pans crack - often from being levered during careless servicing. Water escapes even when the drain is perfectly clear. Replacement of the pan or the fan coil is the honest answer here, and a technician should show you the crack.

Cause 8: Poor insulation on refrigerant piping

If the insulation on the copper pipes has degraded or was never properly sealed, the cold pipe sweats and drips - and the water appears near the pipe entry point rather than the fan coil body. Re-insulating and sealing the sleeve solves it.

Cause 9: The unit is mounted out of level

Fan coils are installed with a slight tilt towards the drain outlet. If a wall bracket has shifted or the unit was installed level or tilted the wrong way, the pan overflows on the high-drain side. A technician can re-level the unit on its bracket.

Which fix do you actually need?

Symptom	Most likely cause	Recommended service	Price
Slow drip from one corner	Blocked drain line	General aircon servicing with drain vacuum	From $40
Dripping plus musty smell	Fouled coil and pan	Aircon chemical wash	From $60
Leak returns weeks after cleaning	Silted or cracked pan	Aircon chemical overhaul	$100 per unit
Water sprays from the vent	Dirty coil, condensate carryover	Aircon chemical wash	From $60
Heavy leak right after switching off	Coil freezing and thawing	$40 diagnostic, then repair or wash	$40 diagnostic
Water behind the unit at pipe entry	Insulation failure	$40 diagnostic and re-insulation	$40 diagnostic

Uncle 7 Aircon price list (Singapore, 2026)

Aircon service	Price
On-site diagnostic inspection	$40 flat
General aircon servicing (1 unit)	$40
General aircon servicing (2 units)	$100
General aircon servicing (3-9 units)	$18 per unit
General aircon servicing (10+ units)	$10 per unit
Aircon chemical wash (1 unit)	$60
Aircon chemical wash (2 units)	$80
Aircon chemical wash (3 units)	$90
Aircon chemical wash (4 or more units)	$28 per unit
Aircon chemical overhaul	$100 per unit

All aircon servicing prices above are flat rates confirmed on WhatsApp before the technician starts. Uncle 7 Aircon is a one-time aircon servicing specialist in Singapore: no contracts, no packages you cannot cancel, and no warranty upsell. You pay for the aircon service in front of you.

HDB versus condo: what differs

In HDB flats, drain lines often run a long way through trunking to a common discharge point, and older blocks tend to have piping that has been extended or rerouted over decades. Long runs mean more places for sludge to settle, so drain vacuuming matters more than it does in a new unit.

In condominiums, leaks are frequently discovered by the neighbour below before the owner notices, because concealed ceiling units in false ceilings can leak for days unseen. Many condos also require management approval and insured contractors for ledge work. Uncle 7 Aircon works with condo access requirements routinely and schedules from 9am to fit within management-permitted hours.

In landed homes, multi-split systems with several fan coils sharing drainage paths mean a single blockage can present as a leak in an unexpected room. Diagnosing which unit is contributing water is part of the $40 on-site inspection.

Preventing aircon water leaking for good

• Vacuum the drain at every service. Insist on it; it is the single most protective step.
• Rinse filters every two to four weeks so less dust reaches the pan in the first place.
• Book general aircon servicing every three months and an annual chemical wash.
• Run fan-only for 10 minutes before shutting down to reduce standing moisture and biofilm.
• Check the outdoor drain outlet occasionally - water should drip out steadily while the aircon runs.
• Do not ignore the first drop. Early drain cleaning at $40 beats a wall repaint and a $100 overhaul later.

Drainage quirks by aircon brand

Every aircon brand ages differently in Singapore's humidity, so aircon servicing is never one-size-fits-all. Here is what the Uncle 7 Aircon team watches for brand by brand.

Daikin aircon servicing

Daikin aircon servicing in Singapore usually involves inverter System 3 and System 4 sets that dominate newer HDB and condo installs. During a Daikin aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Daikin aircon servicing for details.

Mitsubishi Electric aircon servicing

Mitsubishi Electric aircon servicing in Singapore usually involves quiet Starmex fan coils that show dirt build-up as a slow drop in airflow. During a Mitsubishi Electric aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Mitsubishi Electric aircon servicing for details.

Panasonic aircon servicing

Panasonic aircon servicing in Singapore usually involves nanoe-equipped units where a clogged blower wheel is the usual smell culprit. During a Panasonic aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Panasonic aircon servicing for details.

LG aircon servicing

LG aircon servicing in Singapore usually involves ArtCool and Dualcool units with sensitive PCBs that dislike damp. During a LG aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See LG aircon servicing for details.

Midea aircon servicing

Midea aircon servicing in Singapore usually involves budget-friendly System 2 to System 4 sets popular in resale flats. During a Midea aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Midea aircon servicing for details.

Hitachi aircon servicing

Hitachi aircon servicing in Singapore usually involves older wall-mounted units that often need a chemical overhaul rather than a wash. During a Hitachi aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Hitachi aircon servicing for details.

Samsung aircon servicing

Samsung aircon servicing in Singapore usually involves Wind-Free models where blocked micro-holes cut cooling long before the unit fails. During a Samsung aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Samsung aircon servicing for details.

Toshiba aircon servicing

Toshiba aircon servicing in Singapore usually involves units with drain pans that silt up quickly in high-humidity blocks. During a Toshiba aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Toshiba aircon servicing for details.

Fujitsu aircon servicing

Fujitsu aircon servicing in Singapore usually involves compact fan coils common in shophouse and office ceilings. During a Fujitsu aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Fujitsu aircon servicing for details.

Sharp aircon servicing

Sharp aircon servicing in Singapore usually involves plasmacluster units that still need a physical coil clean every year. During a Sharp aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Sharp aircon servicing for details.

Mitsubishi Heavy Industries aircon servicing

Mitsubishi Heavy Industries aircon servicing in Singapore usually involves heavier condensers that need outdoor coil washing in dusty estates. During a Mitsubishi Heavy Industries aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See Mitsubishi Heavy Industries aircon servicing for details.

York aircon servicing

York aircon servicing in Singapore usually involves commercial-leaning systems found in shops, clinics and small offices. During a York aircon service we check the fan coil bearing noise, blower wheel loading, drain pan slope, filter condition and refrigerant behaviour, then advise whether a general aircon service, an aircon chemical wash or a full aircon chemical overhaul is the honest recommendation. See York aircon servicing for details.

Aircon water leaking service across Singapore

Uncle 7 Aircon provides aircon servicing islandwide in Singapore. Aircon servicing needs differ by estate because building age, ledge exposure and drain runs all change how fast a fan coil gets dirty.

Aircon servicing in Ang Mo Kio

Aircon servicing in Ang Mo Kio is shaped by mature HDB blocks where 20-year-old piping means slower drainage. Uncle 7 Aircon covers Ang Mo Kio daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Ang Mo Kio on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Bedok

Aircon servicing in Bedok is shaped by coastal humidity that speeds up coil corrosion. Uncle 7 Aircon covers Bedok daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Bedok on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Bishan

Aircon servicing in Bishan is shaped by a mix of HDB and condo units with heavy evening usage. Uncle 7 Aircon covers Bishan daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Bishan on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Bukit Batok

Aircon servicing in Bukit Batok is shaped by west-side flats with dusty ledges that clog condensers. Uncle 7 Aircon covers Bukit Batok daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Bukit Batok on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Bukit Timah

Aircon servicing in Bukit Timah is shaped by landed homes running System 4 and multi-split setups. Uncle 7 Aircon covers Bukit Timah daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Bukit Timah on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Clementi

Aircon servicing in Clementi is shaped by student and family flats where aircons run almost non-stop. Uncle 7 Aircon covers Clementi daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Clementi on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Hougang

Aircon servicing in Hougang is shaped by older executive flats with long drain runs. Uncle 7 Aircon covers Hougang daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Hougang on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Jurong West

Aircon servicing in Jurong West is shaped by large estates with plenty of 10-year-old inverter sets. Uncle 7 Aircon covers Jurong West daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Jurong West on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Punggol

Aircon servicing in Punggol is shaped by newer BTOs where first servicing is often overdue. Uncle 7 Aircon covers Punggol daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Punggol on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Sengkang

Aircon servicing in Sengkang is shaped by young families running bedroom units through the night. Uncle 7 Aircon covers Sengkang daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Sengkang on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Tampines

Aircon servicing in Tampines is shaped by high-rise blocks with strong wind-driven dust on condensers. Uncle 7 Aircon covers Tampines daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Tampines on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Toa Payoh

Aircon servicing in Toa Payoh is shaped by central flats with tight ledge access. Uncle 7 Aircon covers Toa Payoh daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Toa Payoh on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Woodlands

Aircon servicing in Woodlands is shaped by north-side homes with heavy pollen and dust loading. Uncle 7 Aircon covers Woodlands daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Woodlands on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Yishun

Aircon servicing in Yishun is shaped by estates where trunking runs long and drains silt up. Uncle 7 Aircon covers Yishun daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Yishun on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Queenstown

Aircon servicing in Queenstown is shaped by older blocks needing overhauls more than washes. Uncle 7 Aircon covers Queenstown daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Queenstown on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Serangoon

Aircon servicing in Serangoon is shaped by condos with concealed ceiling units. Uncle 7 Aircon covers Serangoon daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Serangoon on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Pasir Ris

Aircon servicing in Pasir Ris is shaped by seaside flats where outdoor coils rust faster. Uncle 7 Aircon covers Pasir Ris daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Pasir Ris on WhatsApp and we confirm the flat price before the visit.

Aircon servicing in Choa Chu Kang

Aircon servicing in Choa Chu Kang is shaped by large family flats with multiple fan coils. Uncle 7 Aircon covers Choa Chu Kang daily from 9am for general aircon servicing, aircon chemical wash, aircon chemical overhaul, aircon repair, aircon gas top-up and aircon installation. Book aircon servicing in Choa Chu Kang on WhatsApp and we confirm the flat price before the visit.

Why choose Uncle 7 Aircon for aircon servicing in Singapore

Uncle 7 Aircon is a Singapore aircon servicing company built around one idea: honest aircon servicing at a flat price, done properly the first time. Homeowners across HDB flats, condominiums, landed homes, offices, retail shops and F&B outlets book Uncle 7 Aircon because the aircon servicing quote you hear on WhatsApp is the aircon servicing price you pay.

• 10+ years of aircon servicing experience across HDB, condo and commercial aircon systems in Singapore.
• Flat $40 on-site diagnostic inspection for every aircon repair job, quoted before any aircon repair work begins.
• Daily aircon servicing slots from 9am, islandwide. Uncle 7 Aircon does not run after-hours aircon servicing.
• Multi-brand aircon technicians trained on Daikin, Mitsubishi, Panasonic, LG, Midea, Hitachi, Samsung and more.
• 4.9 out of 5 stars from 100+ verified Carousell reviews for aircon servicing, chemical wash and aircon repair.
• One-time aircon servicing only - no maintenance contracts, no warranty gimmicks, no lock-in.

Aircon servicing FAQs (Singapore)

Is aircon water leaking dangerous?

The water itself is condensate, but it can reach electrical components, damage ceilings and walls, and encourage mould. Switch the unit off at the breaker and get it inspected rather than running it with a towel underneath.

Can I fix a leaking aircon myself?

You can rinse the filters and check that water drips from the outdoor drain outlet. Clearing a blocked drain properly needs a vacuum pump and access to the pan, and poking objects into the unit risks puncturing the pan or bending the coil.

Why does my aircon leak only at night?

Overnight running is longer and continuous, so more condensate is produced and a partially blocked drain finally overflows. Daytime short runs may not generate enough water to reveal the blockage.

Does a chemical wash stop aircon water leaking?

In most cases yes, because it clears the coil, pan and drain together. If the leak returns, the pan is likely silted or cracked and an aircon chemical overhaul is the correct fix.

How fast can Uncle 7 Aircon attend a leak?

We book daily slots from 9am and prioritise active leaks where possible. WhatsApp 9431 1589 with your postal code, brand and a photo for the fastest response.

How much does aircon servicing cost in Singapore?

General aircon servicing with Uncle 7 Aircon starts at $40 for one unit, $100 for two units, $18 per unit for 3 to 9 units and $10 per unit for 10 or more units. An aircon chemical wash costs $60 for one unit, $80 for two, $90 for three and $28 per unit from four units. An aircon chemical overhaul is $100 per unit. Aircon repair starts with a flat $40 on-site diagnostic inspection.

How often should aircon servicing be done?

For most Singapore homes, general aircon servicing every three months keeps cooling strong and bills low. Households that run the aircon nightly, keep pets, or live near construction or the sea should service every two months. A chemical wash is typically needed once a year, and a chemical overhaul only when the coil and blower are heavily fouled.

What is included in general aircon servicing?

General aircon servicing includes filter cleaning, fan coil and blower wheel wiping, drain pan and drain pipe clearing, vacuuming of the condensate line, cooling temperature check, airflow check, and a visual inspection of the outdoor condenser. It takes about 15 minutes per unit.

How long does aircon servicing take?

General aircon servicing takes about 15 minutes per unit, an aircon chemical wash takes about 30 minutes per unit, and an aircon chemical overhaul takes about 60 minutes per unit. A three-unit chemical wash appointment usually finishes within 90 minutes.

Does Uncle 7 Aircon offer after-hours aircon servicing?

No. Uncle 7 Aircon starts aircon servicing appointments from 9am daily and does not offer after-hours service. WhatsApp us to reserve a morning or afternoon slot.

Is there a diagnostic fee for aircon repair?

Yes, a flat $40 on-site diagnostic inspection applies to aircon repair jobs. The technician tests the unit on site, explains the fault and quotes the aircon repair transparently before any work begins.

Do you provide aircon servicing for HDB, condo and commercial units?

Yes. Uncle 7 Aircon handles aircon servicing for HDB flats, private condominiums, landed homes, offices, retail shops, F&B outlets and clinics across Singapore.

Do you offer warranty or maintenance contracts?

No. Uncle 7 Aircon is a one-time aircon servicing specialist. There are no maintenance contracts and no warranties - you pay only for the aircon servicing job done on the day.

Which aircon brands do you service?

Uncle 7 Aircon services Daikin, Mitsubishi Electric, Mitsubishi Heavy Industries, Panasonic, LG, Midea, Hitachi, Samsung, Toshiba, Fujitsu, Sharp and York aircon systems, including System 2, System 3 and System 4 installations.

Do you cover my area for aircon servicing?

Uncle 7 Aircon provides aircon servicing islandwide in Singapore, from Jurong West and Bukit Batok in the west to Tampines, Bedok and Pasir Ris in the east, plus all central estates. Share your postal code on WhatsApp and we confirm the slot.

Contact Uncle 7 Aircon

Ready to book aircon servicing in Singapore? WhatsApp Uncle 7 Aircon at 9431 1589 with your postal code, aircon brand, number of units and the problem you are seeing. We reply with a flat aircon servicing price and the next available slot from 9am. You can also compare every service on our aircon servicing price list, browse all aircon services, or read more guides in the Knowledge Hub.