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Water leaks in home HVAC (Heating, Ventilation and Air Conditioning) systems can be a frustrating and expensive problem to deal with. In some cases, the damage caused by a water leak can be severe, leading to costly repairs and even potential health risks.

Fortunately, understanding the potential causes of water leaks can help you to diagnose and repair the problem quickly. Follow through this article to know the causes of HVAC system water leaks.

Causes of Water Leaks in Your HVAC System

Here are some of the most common causes of your HVAC unit leaking water in your home.

Blocked Condensate Drain Pipe

The condensate drain pipe removes the water from inside the air handler. The pipe is connected from the bottom of the air handler to a rain gutter or sump pit. The condensate drain pipe may become blocked with debris or be kinked so it cannot drain properly.

Loose or Damaged Air Handler Sealant

The air handler seals around the outside of it to prevent moisture from getting into your home. But if there is a tear in this sealant (usually due to age or damage), it can cause water to leak out and into your home through this crack in its seal.

Damaged Indoor Coil

When an indoor coil becomes damaged, water can get into your system and leak out onto the floor through this hole in its casing. Check the air handler to see any signs of water damage or mould on it. If so, this may be your problem, and you will want to call a professional for further inspection and repair.

Loose Connections

If your HVAC system is leaking water, it could be due to a loose connection in the unit’s plumbing. Sometimes moisture can build up in the pipes and cause them to corrode. This can lead to them becoming loose and moving around inside the unit. Water will leak out of your unit’s air ducts or floor drains when this happens.

Temperature Problems

Another reason why your HVAC system may be leaking water is due to temperature problems within the system itself. If there is too much pressure within the pipes or if they are not properly insulated, this will increase the chances of them having leaks occurring within them. The most common places for these leaks are tight bends in pipelines or connections that have been made improperly during installation at your home or office building’s HVAC system.

Air Filter is Dirty

An air filter that is clogged with dirt and debris can make it harder for your heating unit to operate efficiently. Dirt particles can also block airflow through vents and cause back pressure within systems that will lead to leakage around pipes and joints.


It is important to thoroughly understand the causes of HVAC system water leaks so that you can identify and repair them quickly. When the HVAC system is properly maintained and serviced, the chances of a leak are greatly reduced. To prevent damage to your home, consider routine scheduling maintenance for your air conditioner or heater.

If you are experiencing problems with your HVAC system, Oshawa hot water tank repair services can help you to identify and repair the problem quickly. Contact Fortis Heating & Air Conditioning today to learn more about how we can help you.

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