Service area: Chiang Mai province
Unit: Drain hose of a wall-mounted aircon
Type of work: Aircon cleaning
When: 2026

1 photos from the job

The unit when I arrived, during the work and when I finished.

During1 photo

All photos from this visitSee the full set

What you can check yourself from this case

Arm explains what the photos show, so you can judge the unit at home yourself.

A blocked drain hose makes water drip from the front of the unit

Condensate from the evaporator coil runs into the drain tray and out through a single drain hose. When sediment builds up and narrows the hose, water overflows the tray and drips down the front of the unit. Often it isn't a leaking unit at all, just a blocked drain.

Where the sediment in the hose comes from

Dust that slips past the filter and settles on the evaporator coil is washed down by condensate every day. Mixed with moisture, it turns into a slimy film on the hose wall. The longer the gap between cleans, the thicker the sediment gets.

What you can watch for yourself

Look at the end of the drain hose outside while the aircon is running. If water drips out steadily, the drain is still flowing. If the aircon has been on for a long time and the hose end is dry, but water is seeping out at the front of the unit, have a technician check the drain.