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Ductless mini-split problems

A mini-split removes ductwork from the list of things that can go wrong. But it keeps almost everything else a central air conditioner has: filters, a refrigerant circuit, and an outdoor unit doing real work.

No ducts, but the same core parts

Ductless systems are common as additions to a house, in rooms a central system does not reach well, or as the primary system in smaller homes. Because each indoor head serves one zone directly, a filter or airflow problem in a mini-split shows up faster and more obviously in that one room than the equivalent problem does in a ducted central system.

Mini-split guides

Not cooling Ductless mini-split not cooling: what to check first

Indoor filters, the outdoor unit, and why a refrigerant leak at a line-set fitting is never a DIY fix.

Not heating Mini-split not heating: why it blows cool air in winter

Wrong mode, a normal defrost cycle, a dirty filter or a cold-weather limit before any refrigerant fault.

Sources

What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.

ENERGY STAR. Air-Source Heat Pumps