When a ductless mini-split or central heat pump system has its indoor blower fan running continuously but fails to deliver warm air into your living space, several mechanical or operational issues are typically at fault. First, check your remote or thermostat settings to confirm the system is switched explicitly to the "Heat" mode rather than "Cool" or "Fan Only" settings. Second, the outdoor unit may be locked in an extended defrost cycle to clear ice from its exterior coils during freezing weather. Third, severe refrigerant leaks or a malfunctioning reversing valve that fails to redirect hot gas into the indoor coil will cripple heating capacity. You can troubleshoot by checking error indicator lights. You can verify that the system is functioning properly when resetting control power or resolving refrigerant leaks restores warm air delivery.
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