When a residential air conditioning system suddenly stops blowing air out of your indoor supply vents during operation, it is usually triggered by an electrical safety lockout, a tripped circuit breaker, or a safety switch activation. A frequent culprit is a clogged condensate drain line that triggers a safety float switch, cutting off power to prevent water damage to your home. Another common cause 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 air handler. Additionally, a thermal overload event can cause the blower motor to shut down temporarily. 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 blower motor.
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