Articles

Common Mini Split Issues & What to Do

December 10, 2024

Categories: Ductless Mini Splits

A man's hands changing the filter on the indoor unit of a ductless mini split

When you chose to install a ductless mini split system in your home, you were drawn to its impressive energy efficiency, the ability to create customized comfort zones throughout your house, and its whisper-quiet operation. The sleek, modern design was just the icing on the cake. But like any HVAC system, mini splits occasionally encounter issues that need attention. In order to help you take prompt action to maintain the unit’s efficiency and prevent minor problems from escalating into major repairs, we’ve provided a list of the most common mini split issues and what you can do about them.

Weak or No Airflow

One day, you might notice that the usually robust airflow from your mini split has become more of a gentle breeze — or worse, completely nonexistent. This frustrating issue often stems from clogged air filters, which prevent proper air circulation through the system. When dust, pet dander, and other airborne particles accumulate on the filters, they create a barrier that forces your unit to work harder while delivering less air.

The good news is that this is typically an easy fix. Start by carefully removing and inspecting the filters. If they’re dirty, give them a thorough cleaning with warm water and mild soap, or replace them if they’re beyond cleaning. For optimal performance, make it a habit to clean your filters every 4-6 weeks.

If cleaning the filters doesn’t resolve the issue, the problem might lie with the blower motor or fan, which requires professional attention.

System Not Cooling or Heating Properly

There’s nothing more disappointing than setting your desired temperature only to find your space remains uncomfortably warm or cold. If your mini split system isn’t blowing hot air or producing cold air (depending on the settings), the problem may stem from a refrigerant leak, an incorrectly sized unit, or problems with the outdoor compressor unit. While comfort is certainly a concern with this mini-split problem, you primarily want to act quickly in these situations to prevent wasting energy and potentially shortening the system’s lifespan.

Before calling a professional, check a few things yourself. Ensure your outdoor unit isn’t blocked by debris, vegetation, or other obstacles. Verify that your temperature settings are appropriate for the season and that you haven’t accidentally switched between cooling and heating modes.

If these basic checks don’t reveal the problem, it’s time to contact a qualified technician who can properly diagnose and address mini split issues like refrigerant levels or compressor problems.

Water Leaks and Drainage Issues

Finding water dripping from your indoor unit can be alarming. While mini splits are designed to handle condensation, various factors can disrupt proper drainage. For example, the condensate drain line might be clogged with dirt, algae, or even small insects, preventing water from flowing freely. In colder weather, the drain line might freeze, forcing water to back up and leak from the indoor unit.

If you suspect your mini split air conditioner is having drainage problems, check the unit’s drain pan and pipe for obvious blockages. You can try clearing minor clogs by carefully flushing the drain line with warm water or a mild vinegar solution. Then, ensure the indoor unit is mounted level or slightly tilted toward the drain pipe to facilitate proper water flow. If the problem persists, it’s best to seek professional help to prevent water damage to your walls and flooring.

Strange Noises During Operation

Since mini splits are known for their quiet operation, unusual sounds like buzzing, clicking, or rattling should never be ignored. These noises often indicate loose components, debris in the fan, or more serious mechanical issues.

Begin by listening carefully to identify the source and type of noise. Sometimes, a simple tightening of screws or removal of debris near the fan can solve the problem. However, if you hear grinding, screeching, or loud banging sounds, turn off your system immediately and contact a professional for a mini split repair. These noises could signal serious issues that, if left unaddressed, might lead to system failure.

Ice Formation on the Outdoor Unit

Finding ice on your outdoor unit during winter operation might seem normal, but excessive ice buildup can significantly impact your system’s performance. This issue often occurs when the defrost cycle isn’t working properly, outdoor temperatures are extremely low, or there are problems with the system’s refrigerant levels.

Never try to chip away at the ice manually, as this could damage delicate components. Instead, you can try running the system in fan-only mode to help melt the ice naturally. If ice continues to form quickly or extensively, it’s time to have a qualified technician check your system’s defrost cycle and refrigerant levels.

Bad Odors Coming From the Mini Split

Are ductless mini split smells overtaking your living space? These unpleasant odors can range from musty and moldy to burning or even dirty sock-like scents, each indicating different potential issues within your system. The root causes are often related to moisture, bacterial growth, or accumulated debris that has been sitting in your unit for an extended period.

Because mini split systems create condensation during operation, moisture can accumulate in the unit’s interior, creating a perfect breeding ground for mold and mildew. You will want to keep an eye out for this type of microbial growth around the filters and drain pan, which often produce that musty smell that’s hanging around your home.

Additionally, if you haven’t cleaned your unit regularly, dust, pet dander, and other organic materials can collect inside, further contributing to unpleasant odors and creating other common mini split problems. To combat any smells, remove and wash the filters with mild soap and warm water, ensuring they’re completely dry before reinstalling. For a deeper clean, you can use a mixture of white vinegar and water to disinfect the interior components.

If cleaning doesn’t resolve the issue, the problem might be more complex. A burning smell could indicate electrical issues or overheating components, which require immediate professional attention.

Call Our Professionals for Help Troubleshooting Mini Split Air Conditioner Problems

While some mini split issues can be resolved with simple DIY maintenance, others require expert attention. Trust your instincts — if something seems seriously wrong or your troubleshooting efforts aren’t yielding results, contact the professionals at Martinov Home Solutions. Our experienced technicians understand mini split repair needs and can quickly diagnose and resolve problems to restore your comfort and peace of mind.