When a ductless mini-split or conventional split air conditioning system stops producing chilled air, the malfunction is typically caused by restricted airflow, electrical faults, or refrigerant loss. The most common culprit is a severely clogged, dirty indoor air filter that chokes the evaporator coil and causes it to freeze solid into ice, halting thermal exchange completely. Other frequent causes include a tripped circuit breaker at the main electrical panel, a faulty outdoor fan or compressor capacitor, communication errors between indoor and outdoor inverter boards, or a physical refrigerant leak. You can troubleshoot by inspecting filter cleanliness and checking remote settings. You can verify that the issue is resolved when clearing filter blockages, thawing frozen coils, or repairing electrical faults restores normal chilled air output.
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