MHI · Air Conditioning
During heating operation, the green RUN light on the indoor unit will blink with a pattern of 1.5 seconds ON and 0.5 seconds OFF. This indicates that the airflow is temporarily stopped to prevent cold air from blowing out.
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Allow the unit to continue heating operation; this is normal behavior.
Do not switch off the unit, as it is managing its internal temperature.
If the issue persists or heating performance is poor, ensure filters are clean.