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5 Common Reasons Of HVAC Failure

Your HVAC system plays a significant role in giving your family comfort by keeping your home cool and comfortable. There are several different reasons why you need to get regular HVAC maintenance and repair, and having these problems taken care of immediately will help you save money eventually.

Home HVAC units are designed with complex electrical connections and there is a possibility that it could break down although it is branded or new. It may be down to the manufacturer, however, there are other factors that contribute to the failure of your home HVAC unit. Here are the 5 common reasons of HVAC failure:


Broken Thermostat

There are different components inside your HVAC system unit, and the one that helps regulate the temperature in your house is the thermostat. This is the tool you use to set your home at a good temperature. Once you notice that your room is warmer or cooler than you want, then there could be a problem with the thermostat. There are some ways you can determine if you have a broken thermostat is that the heating or cooling system doesn’t turn off, it is not setting the temperature correctly in your room, or you reset the temperature, and the HVAC system does not work.

Some common problems with this component are the wiring connections. Getting this examined will determine if this is the culprit for the problem or not. It is also possible that the sensor is broken or the thermostat is outdated. These issues need to be addressed immediately to fix your HVAC system. In some cases, the programmable thermostats have batteries that must be replaced regularly. If it still does not work, issues can be identified by a service technician.


Dirty Filters

If you want to extend the life and efficiency of your heating and cooling system, then you need to replace your filter regularly. When your filter is filthy, it will block airflow resulting in your unit to work harder to distribute air around your house. It gives unnecessary pressure on the blower of your furnace and will cause discomfort as well. If your filter is covered with contaminants and molds, it can cause the furnace to overheat and turn off at a high limit.

When this is the only problem with your HVAC unit, it could be a costly repair to make. The filters must be replaced monthly during peak seasons of summer and winter so that the air pollutants can be removed, and not redistributed throughout your house. If the filters are not periodically changed, it pushes the HVAC system unit to work double-time, because the contaminants in the filter can block the airflow. If your filter is washable, you can clean it every three months. When you don’t change your HVAC filter, it will become one of the reasons why your heating and cooling systems break down. This is the most important part of preventative measures that you can do yourself.


Blower Runs Continuously

There are some reasons a furnace blower may work continuously. Before you contact a professional, inspect the switch on the thermostat. The motor will run constantly if the thermostat is adjusted to the fan on position. It usually happens when you accidentally switch the fan on.

There is a fan switch in the system that turns the blower on once there is a need for heat; if the switch sticks, the blower will stay on. There are different types of limits on the furnace. Once activated, the circuit board may make the system cool it down. When the limit does not adjust, the blower will not turn off. A professional service technician can check this problem and provide repair works.


Leaking Refrigerant

This is one of the most common problems with HVAC units, and it can result in either poor performance, or complete breakdown when the problem gets worse. The condenser units in your HVAC system need a refrigerant so that it can cool the incoming air in your house, and if the refrigerant in the system is insufficient, expect that your air conditioner won’t function properly.

Your cooling and heating system will produce condensates. The drain pipes are used to make sure of the proper water drainage. Your heating system can leak water once the drain pipes have either holes or clogs. You can help maintain the drain pipes clean by bleaching them down the drain regularly. Another leak source could be the evaporator drain pan, collector box, or heat exchange. A certified technician should be called on to diagnose the source of the water leak and the repair services needed.


Blown Fuses

One of the possible reasons why the heating system trips a circuit breaker is an overworking blower. When something is preventing the airflow from your furnace, your blower has to work double-time to stabilize it. A dirty air filter is one of the possible reasons. If the air filter is filthy, your blower has to work extra miles to push the air through the filter. It spikes up the blower’s power usage and can trip the circuit breaker at some point. Inspect your filter and change it with a clean one prior to resetting your circuit breaker. 

When the problem happens again, it is high time to call an expert who can determine when the problem is due to a furnace issue or  the circuit breaker may have broken down. Some problems that can give some pressure to the blower include the dirty coils, duct leaks, closed or blocked-off air registers. When resetting the breaker deals with the problem, it could have only been a break, however, when the breaker trips repeatedly, the safest thing to do is call a professional for service work.

You can take specific precautionary measures for the optimal working condition and prevent major issues in your HVAC system unit through understanding where the problem originates. If you are proactive about the condition of your system, you will be able to boost efficiency, regulate energy consumption, and keep your family comfortable and safe.


While these problems seem easy to handle, they do need a professional. Fixing the problems yourself possibly get you or your family injured or get your HVAC system even worse. If you are looking for an HVAC maintenance and repair service, don’t hesitate to contact HVAC Alliance Expert. Our highly trained technicians will diagnose the problem and make the necessary repair in a timely and efficient manner.

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