Forcing an AC compressor to turn on manually requires bypassing standard thermostat signals, which carries high electrical shock risks and should only be performed by trained technicians. Typically, technicians use a jumper wire across the Y and R terminals on the indoor control board or manually push in the contactor relay switch inside the outdoor unit while wearing insulated gloves. However, forcing a compressor to run when safety switches or delay timers are active can severely damage the motor. Verification: Check that 24V power reaches the contactor coil before attempting any manual overrides.
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