Getting a non-responsive indoor air handler blower motor to kick on requires following a troubleshooting sequence to clear electrical power interruptions and control faults. First, check your indoor wall thermostat to ensure it is calling for fan or heating/cooling operation. Second, go to your home's main electrical panel and verify that the circuit breaker dedicated to the air handler hasn't tripped. Third, inspect the 3-amp or 5-amp low-voltage control fuse on the indoor furnace control board, replacing it if blown. Fourth, check your condensate drain line float switch; if water is backed up, the switch will cut power. Fifth, check the motor's run capacitor. You can troubleshoot safely by turning off power before inspecting internal components. You can verify that your troubleshooting was successful when power is restored and the blower motor engages smoothly.
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