A central air conditioning system typically takes anywhere from 5 to 30 minutes to reset itself after experiencing a power disruption, blown fuse, or thermal overload trip. When power is restored or a hard reset is performed, modern thermostats and control boards incorporate built-in compressor delay timers (usually lasting 3 to 5 minutes) to prevent short-cycling and protect the expensive compressor motor from damage under high refrigerant pressures. Verification: Check the digital thermostat display for blinking delay indicators and listen for the outdoor unit to start up after the delay expires.
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