Ductless System Maintenance

If your home is equipped with a ductless system, or you’re considering having one installed, use the ductless system maintenance tips below to help you keep the mini-split heating and cooling system running smoothly.

The popularity of ductless, or mini-split, heating and cooling systems is growing in the U.S., especially in areas where older houses are heated by radiator or electric baseboard heaters. Mini-split heating and cooling systems can be installed in houses with no existing ductwork by mounting interior wall units strategically throughout the home.

Ductless system preventative maintenance for homeowners

While most ductless system maintenance should be performed by a certified dealer, there are a few preventative maintenance measures you can take to maximize the efficiency of your unit. Before starting any ductless system maintenance, remember to turn off each component in the system, including the outdoor and indoor units.

  • 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 owner’s 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.

Ductless system maintenance checklist for Trane Comfort Specialists

Your mini-split system should be serviced by a professional at least once per year. Here are a few of the things your local Trane Comfort Specialist will look at when performing annual ductless system maintenance.

  • Check electrical connections. All electrical connections inside the condensing unit should be spot-checked for loose connections, short circuits or evidence of overheating. And faulty connections should be repaired immediately. 
  • 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.

If you’re experiencing specific problems with your mini-split system, check our ductless system troubleshooting guide. If you are unable to identify or resolve the problem on your own, contact your local Trane Comfort Specialist and schedule a visit.