My HVAC Unit Stopped Working After Air Filter Change

My HVAC Unit Stopped Working After Air Filter Change

Changing your air filter is an important part of keeping your heating and cooling system running smoothly. This is because the air filter prevents dust and debris from getting inside the HVAC unit. If you’ve recently changed the air filter in your unit, but it stopped working soon after, it can be very confusing to figure out what went wrong.

When your AC stops working, it can be very frustrating. Even more so if you’ve just replaced the air filter or made some other type of repair recently. If your HVAC system stopped working, it could be due to one of these reasons:

  • Your air filter is dirty
  • A breaker tripped
  • Issues with thermostat
  • Mechanical issues
  • Refrigerant levels are too low

Dirty Air Filters

Air filters allow airflow through the system, which in turn helps circulate the air inside your home. They catch all the dirt and debris that get sucked into the system. Small dust particles can get into your HVAC system and clog everything up.

Restricted airflow is a major cause of problems in the system. Not only can it make your system work harder, but if the coils ice over, it can cause the system to stop working.

Changing the air filter should not cause any equipment to stop working. However, this does occasionally happen for unknown reasons. Most often, it is due to another cause. Make sure the filter is the right type for your system, has good airflow, and is installed correctly. Also, make sure to remove any plastic outer packaging before installing.

Tripped Breaker Switch

If you change the air filter and the system won’t turn on, there may be a reset button or breaker switch that you need to reset to kick the system back on. Not every system has one, but it is something to look for if you’re not getting any power after replacing the filter or if it shuts off suddenly. It will be located nearby the unit or maybe in the breaker box, and you’ll recognize it as a switch that is flipped in the downward position.

Issues with Thermostat

Another thing to check is the thermostat. Make sure the thermostat is set properly for it to kick back on. Check your batteries if you set the thermostat and the system doesn’t kick on, or you aren’t getting any power to the thermostat. Sometimes there is a battery inside the thermostat that needs replacing periodically. If that goes dead, it will keep the HVAC system from turning on.

Mechanical Issues

A frozen evaporator coil will keep the system from turning on due to restricted airflow. Other issues that can cause the system not to work are a faulty fan, blocked or dirty vents, condenser fan motor, and thermostat sensor problems. If you experience mechanical issues, your system may work inefficiently (not cooling) or not at all.

If you continue to experience problems, contact TDI Air Conditioning for an evaluation of your HVAC system. Our technician will assess your system and troubleshoot the cause of the problem. With the right tools and experience, we’ll have you back up and running in no time.