When a Carrier indoor air handler refuses to turn on, you can follow a structured troubleshooting sequence to restore operation. First, check your main electrical breaker panel to ensure the circuit breaker dedicated to the air handler hasn't tripped, and reset it if necessary. Second, turn off power at the breaker, remove the Carrier service access panel, and inspect the control board for a blown 3-amp or 5-amp low-voltage fuse, replacing it if the internal wire is broken. Third, check your condensate drain line and safety float switch; if water is backed up, the switch will cut power to prevent flooding. Fourth, verify that your thermostat is calling for air. You can troubleshoot safely by wearing work gloves. You can verify that your fix was successful when power is restored and the blower motor starts running normally.
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