Verify that the thermostat is issuing a call for activity.
Check the circuit breaker for trips or accidental shutoff.
Verify that the wiring harnesses are securely connected to the
control connectors.
Inspect for shorts or detached wiring.
Inspect the control for broken or loose connectors, moisture,
excessive dirt, or other damage.
Inspect the motor and blower for accumulated dirt, internal debris,
or other signs of damage.
Inspect the blower fan for bent or missing blades, misaligned
shaft, or unsecured mounting to the shaft.
Inspect the blower housing for cracks, dents, or corrosion.
Inspect the blower housing for secure mounting to the system
chassis.
Inspect the shaft and verify that the motor shaft spins freely
without effort or assisted means in both directions.
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