Everyone who has ever had an issue with their HVAC system knows that problems always arise at the worst of times. Nothing is worse than your air conditioner giving out right in the middle of the summer, or your heating going on the fritz once the cold weather strikes. Understanding the common problems that can arise and knowing how to diagnose them can save you time, money, and frustration the next time disaster strikes your system.


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If your thermostat is malfunctioning, it will inevitably lead to your system not performing the way you need it to. If your thermostat is programmable, it may just be a programming and scheduling issue. Calibration errors can cause your thermostat to display the wrong temperature or fail to maintain the correct one. A faulty thermostat can also cause short cycling, which is when your HVAC system is turning off and on within short intervals. This can damage your system’s lifespan and reduce energy efficiency. Make sure your thermostat is responsive, properly calibrated, and correctly programmed.

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Over time, your HVAC system will get dirty. It’s important to keep everything clean in order for it to run smoothly! Air filters should be changed regularly to ensure against clogging, as blocked filters can cause unnecessary strain on your HVAC system, as well as reducing your air quality indoors, which can trigger allergies. You should also pay attention to your condensers and evaporator coils. Dirty evaporator coils and condensers will also reduce the efficiency of your system and can cause uneven temperature distribution. Changing your air filters is typically an easy DIY, but dirty condensers and evaporator coils should be cleaned by professionals.

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Refrigerant leaks in HVAC systems can have significant consequences on the cooling or heating performance, energy efficiency, and overall operation of the system. Leaks can be caused by a variety of issues, including corrosion, poor installation, physical damage, excessive vibrations from the HVAC system, or manufacturing defects. Because refrigerant is the key substance that absorbs and releases heat in the HVAC system, leaks can result in a reduction in your system’s heating or cooling capacity. It can also cause your evaporator coils to become too cold an freeze over. Naturally, your system will undergo unnecessary strain in these conditions. Refrigerant leaks should be addressed by trained HVAC technicians who have the expertise to locate the leaks accurately, repair the system, and recharge it with the correct refrigerant levels. This ensures that the HVAC system operates efficiently and provides optimal cooling or heating performance.

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Furnaces or boilers may experience issues with ignition or pilot control. This can result in a system that fails to ignite or a pilot light that keeps extinguishing, leading to no heat or unreliable heating. When facing ignition or pilot control problems, it is recommended to contact a qualified HVAC technician. They have the expertise to diagnose and address the specific issue, whether it requires cleaning, adjusting, or replacing components. Technicians can also ensure that safety measures are followed and that the heating system is restored to its proper functioning to provide reliable and efficient heat.


By familiarizing yourself with the signs and symptoms of common problems like thermostat issues, dirty components, refrigerant leaks, and pilot ignition problems, you can take proactive steps to address these issues promptly. Remember, while some troubleshooting can be done on your own, it's important to consult with a professional HVAC technician for complex repairs or if you're unsure about any aspect of your system. By staying vigilant and proactive in identifying and resolving HVAC issues, you can ensure that your system operates efficiently, maintains optimal comfort, and lasts for years to come.

Dexcomm has been servicing the HVAC industry since 1954. Click here to learn more about what Dexcomm can do for your HVAC business.

Dexcomm is a Louisiana-based corporation that provides answering services to businesses and service agencies across the United States. We have been open since 1954, employ a staff of roughly 80 people, and our average client retention rate is 10+ years.

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Read More About The Author: Katie Atkins