When your indoor air handler blower fan is running continuously, but your outdoor air conditioning condenser unit remains completely silent and inactive, it points to a specific break in the outdoor power supply or control communication circuit. Common culprits include a tripped outdoor electrical disconnect box switch, a tripped heavy-duty 240V circuit breaker in your main panel dedicated to the compressor, or a burned-out dual-run capacitor inside the outdoor unit. Additionally, a severed low-voltage control wire running from the indoor unit to the outdoor contactor will block the 24V signal needed to engage the compressor. You can troubleshoot by checking the outdoor disconnect box and inspecting the control wiring. You can verify that the repair was successful when testing voltage reveals the outdoor contactor closes and both the compressor and fan engage.
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