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What Causes Evaporator Coil Leaks?

Evaporator coils are a crucial component of a residential HVAC system, as they help to cool and dehumidify the air inside a home. When these coils start to leak, it can be a major problem for homeowners. Not only does a leaky evaporator coil reduce the efficiency of the HVAC system, but it can also lead to water damage and costly repairs. In this blog, we will explore some of the common causes of evaporator coil leaks in residential HVAC systems.

One of the primary causes of evaporator coil leaks is corrosion. Over time, the coils can begin to corrode due to exposure to moisture and other elements, such as dust and dirt. As the corrosion progresses, it can create small holes or cracks in the coils, which can then lead to leaks. This is especially common in older HVAC systems that have not been properly maintained or have not received regular cleanings.


Another cause of evaporator coil leaks is a clogged drain line. The evaporator coils are responsible for removing moisture from the air, which is then collected and drained away through a drain line. If this drain line becomes clogged, it can cause water to build up and eventually leak from the coils. This can be caused by a variety of factors, including debris, algae, and even animal nests.


A third cause of evaporator coil leaks is a faulty or malfunctioning expansion valve. The expansion valve is responsible for controlling the flow of refrigerant to the evaporator coils. If this valve becomes stuck or fails to function properly, it can cause refrigerant to leak from the coils. This can lead to both a leaky evaporator coil and a reduction in the overall efficiency of the HVAC system.


In addition to these common causes, there are a few other factors that can contribute to evaporator coil leaks. For example, if the HVAC system is improperly installed or maintained, it can lead to leaks. This is why it is important to have your system regularly inspected and serviced by a professional HVAC technician. Another potential cause of evaporator coil leaks is a lack of proper insulation. If the insulation around the coils is damaged or insufficient, it can cause condensation to form on the coils, which can then lead to leaks.


If you suspect that your HVAC system has a leaky evaporator coil, it is important to address the issue as soon as possible. A leaky evaporator coil can lead to a variety of problems, including water damage, reduced efficiency, and higher energy bills. To prevent these issues, it is recommended that you have your HVAC system regularly inspected and serviced by a professional technician. By doing so, you can catch any potential issues early on and avoid costly repairs down the road.

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