When a split air conditioning system or ductless mini-split suddenly stops cooling your living space, it is typically caused by a restricted airflow blockage, a dirty air filter, electrical power issues, or a sudden loss of refrigerant due to a leak. If the indoor air filter is severely clogged with dust and pet hair, it chokes the evaporator coil and causes it to freeze solid into a block of ice, halting heat exchange entirely. Other potential culprits include a tripped outdoor circuit breaker, a faulty compressor capacitor, or communication errors between indoor and outdoor inverter boards. You can troubleshoot by inspecting filter cleanliness and checking outdoor unit power. You can verify that the issue is resolved when clearing restrictions, thawing frozen coils, or repairing electrical faults restores powerful chilled air output.
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