Field note
For a belt-driven exhaust fan, 'motor runs' and 'air moves' are separate checks.
From breaker to motor
- Verify breaker/disconnect/fuses, control relay/contactor, motor voltage, and current.
- If a breaker tripped, check for a locked bearing, seized wheel, shorted motor/wiring, or overloaded drive before repeated resets.
From motor to wheel
- Inspect belt condition/tension, pulley alignment, set screws, shaft/key, motor and fan bearings, and wheel rotation.
- Check rotation direction and whether the wheel is slipping or rubbing.
From wheel to occupied space
- Verify dampers are open and duct/intake/discharge are not blocked.
- Confirm actual airflow/noise at the reported area after the roof repair; do not stop at the fan cabinet.
Safety / model checks
- Lock out the fan before removing guards or touching belts, pulleys, shafts, or wheels.
- Replace guards before energizing and keep clear of discharge/intake openings.
Exhaust FanBeltAirflow
Safety note
HVAC work can involve high voltage, rotating equipment, pressurized refrigerants, and combustion systems. Use this site as a reference only. Follow the equipment manual, applicable codes, PPE, lockout/tagout, and current refrigerant rules. Field cases and troubleshooting paths are case-specific and are not OEM procedures or universal targets.
Related field cases
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