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Ductless Mini Split Operating, Maintenance and Troubleshooting Tips

Ductless mini split systems provide a viable indoor comfort option for residential clients who don’t have the physical space for a standard ducted heating or cooling system. Here are some tips for keeping ductless mini splits working properly and for troubleshooting them when things go wrong.



Ductless mini splits have three major components: the compressor, which is installed outdoors; the air handlers, which are installed indoors; and the remote control. The indoor components are connected to the outdoor unit through a hole in the wall about three inches in diameter.

In general, mini splits are simple systems, but they must be installed correctly for them to function properly. Installation kits are often available for those who want to do their own installation, but in most cases, it’s a better idea to let a professional install the equipment.


Like all HVAC systems, ductless mini splits need regular preventive maintenance and cleaning. Since they’re based on heat pump technology, they’re very efficient and reliable, but maintenance tasks such as the following are necessary to sustain that performance:

  • Change the air filter and clean the unit regularly. Pay particular attention to the compressor; if it gets dirty, it can overheat and cause the unit to break down.
  • You should also make sure the outdoor component is in a clear area and that grass, shrubs or other vegetation have been trimmed away from the unit.
  • Contact your local trusted HVAC professional for preventive maintenance at least twice a year — once before cooling season and again before heating season.


The mini split will likely produce some condensation during operation, so make sure there’s an appropriate area for condensation drainage. Otherwise, the water could leak back into your building and cause damage.

Learn more about ductless mini splits, including Air Experts’ ductless options, or give us a call at 919-480-2727 for installation and maintenance solutions.

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