AC Leaking Water Toronto: What to Do Right Now

What to do, in order

1. Switch the cooling off at the thermostat

   Set the system to off, not just to a higher temperature. As long as it keeps running it keeps producing water, and every extra litre goes onto your floor. Leave the fan off too.

2. Contain the water and protect what is under it

   Towels and a shallow tray under the leak, and move anything stored nearby. If the indoor unit sits above a finished ceiling, check the room below for staining or a bulge; water pooling above drywall comes through suddenly.

3. Cut power if water is near anything electrical

   The indoor unit sits beside the furnace and its electrical connections. If water has reached wiring, the furnace or an outlet, switch off that circuit at the breaker, but only if you can reach the panel without standing in water.

4. Look for ice on the pipes

   If the refrigerant lines or the indoor coil are iced up, the water is melt from that ice. Leave the system off and the fan on to thaw it, then replace the filter. Icing means restricted airflow or low refrigerant, and it needs a technician either way.

5. Check the condensate drain and pan

   Find the small pipe running from the indoor unit to a floor drain or a condensate pump. If there is a pump, check whether it is running and whether its reservoir is full. A pump that has failed, or a drain line clogged with algae, is the most common cause of all.

6. Call us

   Our assistant confirms what you are seeing, may recommend a service call based on those symptoms, and asks for your postal code before connecting you live to a technician who is available now. Say whether there was ice, and whether you have a condensate pump; it helps the technician get to the root cause faster and tells them what to bring.

What happens once you call

The technician will clear the condensate drain, address a clogged drain line, check or replace the pump, and make sure the pan drains as it should. A wet/dry vacuum may be used first to pull out the clog before the line is flushed. If ice was the cause, they will look for the actual reason: a restricted air filter, a blocked return, a failing blower, low refrigerant levels, or a refrigerant leak. Topping up refrigerant without finding the leak is not a repair, and a good technician will say so as part of checking the whole cooling system, not just the visible leak.

If the leak keeps returning, a certified technician should also check for a blocked drain line, a failed pump, or signs of improper installation. When water is actively dripping, same day service can matter to limit water damage.

Water that has been sitting for a while is a separate problem. Dry the area thoroughly, lift anything that has absorbed water, and if it reached a ceiling or wall cavity, treat it as a moisture issue and check for mould in the following weeks.

Where the water is actually coming from

An air conditioner pulls moisture out of the indoor air as it cools, and that condensation can add up to several litres a day in a humid Toronto July. That water is supposed to collect in a pan and leave through a condensate drain, but a clogged drain line often builds up from algae, dust, and debris inside the condensate drain line. Water on the floor almost always means the condensate drain path is blocked, not that the unit is broken, and blocked or improperly sloped drain pipes can leave water pooling instead of draining properly.

The usual causes, in rough order: a clogged drain, a failed condensate pump if the unit sits below the drain, a rusted or cracked drain pan on an older system that often fails around the 10 to 15 year mark, improper installation, or a frozen evaporator coil that is now melting. That last one is worth catching, because the cold evaporator coil pulls moisture from the air, and when it freezes and thaws, excess water can overwhelm drainage; the ice is a symptom of restricted airflow or low refrigerant rather than the problem itself. In very humid weather or on a hot day, the system can produce more condensate, so existing drainage problems show up faster.

It matters more than it looks. The water is sitting directly above or beside the furnace, and a slow leak into a furnace cabinet does expensive damage quietly over weeks, so prompt repair helps prevent further damage and more costly repairs. Use a wet/dry vacuum to clear drain line clogs if the blockage is accessible, but recurring water leaks still need a proper inspection.