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Caring for your ductless system

Tips for Peak Performance

Most ductless system maintenance should be performed by a certified dealer, but there are a few maintenance measures you can do yourself. Before starting any maintenance, remember to turn off each component in the system, including the outdoor and indoor units.

Ductless System Maintenance


The following information is for educational purposes only. Tampering with your system may void your warranty. If you have any questions about your system, call a Trane Comfort Specialist™.

Homeowner DIY maintenance

Keep the system clean

Wipe down the outside of the unit with a damp cloth to prevent dust from accumulating.

    Make sure there is space around the unit

    Don’t put bookcases, picture frames or any other furniture close to a ductless system.

      Clean the filters

      Each indoor evaporator unit has a removable air filter that should be cleaned regularly. Clean these filters at least as often as recommended in your user manual, or more often if your family is sensitive to dust or if you own pets.

        Clean the condenser

        Make sure the outdoor unit is powered off, then, using a garden hose, spray any dust and dirt off of the coil. Avoid using high water pressure, as the fins can be easily bent. If you accidently bend some of the fins, they can be easily bend back into place with a special alignment comb.

          Dealer Maintenance

          Your mini-split system should be serviced by a professional at least once per year. Here are a few of the things your specialist will check for:

          Check electrical connections

          All electrical connections inside the condensing unit should be spot-checked for loose connections, short circuits or evidence of overheating.

            Check the run capacitors

            The run capacitors should be checked for bulging, deformation or leaks. If any are present, faulty run capacitors should be replaced.

              Look for refrigerant leaks

              Refrigerant lines should be checked for signs of leaks, and patched or replaced where necessary. Leaks are especially common at flare connections, which may need to be tightened.

                Check the drain hose for blockages

                The hose that moves condensation from the evaporator units should also be checked to make sure water is flowing freely.