An air conditioning system suddenly stopping out of nowhere during operation is typically triggered by an electrical safety lockout, a tripped circuit breaker, or a safety switch activation. A frequent cause is a clogged condensate drain line that triggers a safety float switch, cutting off power to prevent water damage to your home. Another common culprit is a power surge or electrical short that blows the low-voltage control fuse on your indoor furnace control board, instantly shutting down the thermostat and AC. Additionally, a high-pressure safety switch inside the outdoor condensing unit will trip if the outdoor coil is blocked and overheating. You can troubleshoot by checking your main circuit panel, inspecting the furnace fuse, and clearing condensate lines. You can verify that the fault is cleared when resetting power restarts the system.
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