An AC leaks water when the condensate it normally drains away has nowhere to go. The most common causes are a blocked or algae-clogged drain line, a frozen evaporator coil that melts and overflows, a cracked or misaligned drain pan, or a unit installed without the correct slope. In Qatar's humidity, units produce a lot of condensate, so a small drainage fault quickly becomes a visible leak.
Where the water comes from
Cooling pulls moisture out of your indoor air; that condensate collects in a pan and drains outside. Anything that interrupts this path — a clogged drain, a full pan, ice on the coil — sends water into your ceiling or down the wall instead.
Common causes of AC water leaks
- Blocked condensate drain: dust, algae and biofilm clog the drain line — the most common cause here.
- Frozen evaporator coil: low refrigerant or weak airflow ices the coil, which then melts and overflows the pan.
- Cracked or rusted drain pan: older units develop pan leaks.
- Incorrect installation slope: if the unit or drain isn't pitched correctly, water pools and backs up.
- Disconnected or loose drain fittings: vibration works joints loose over time.
What you can safely do now
- Switch the unit off to stop further water and protect ceilings/electronics.
- If you can see ice on the indoor unit, leave it off to thaw.
- Place a container to catch drips, and clear anything valuable from below.
Clearing the drain line, refrigerant work and pan repairs should be done by a technician.
How an AGM engineer fixes it
We locate the source, flush and clear the condensate drain, treat it to stop algae regrowth, repair or replace a damaged pan, correct the slope if the install is wrong, and check refrigerant and airflow if the coil was freezing. We also confirm the drain runs to a proper outlet. Regular servicing under an AMC keeps drains clear and prevents repeat leaks.
Frequently asked questions
Most often a blocked condensate drain or a frozen coil that overflows the pan when it melts. Both are common in Qatar's humid, dusty conditions and need the drain cleared or the underlying airflow/refrigerant fault fixed.
It can be. Water can damage ceilings, walls and electrics, and points to a fault that will worsen. Switch the unit off and get it looked at quickly.
You can switch it off, catch drips and let a frozen coil thaw. Clearing the drain line, repairing the pan or refrigerant work should be left to a technician.
Have the condensate drain cleared and treated during regular servicing, keep filters clean so the coil doesn't freeze, and make sure the install slope is correct.