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Aircraft Maintenance TroubleShoot > Heater Troubleshooting South Wind 8472

Both blowers run but heater fails to start

1. Defective spark plug.
2. Obstruction in combustion air passage.
3. Defective ignition coil.
4. Defective solid state ignition unit.
5. Open circuit in thermostat.
6. Airflow switch open.
7. Defective fuel pump.
8. Remote solenoid closed.
9. Defective solenoid coil or clogged nozzle.
10. Open circuit in duct limit switch.
11. Defective fuel pump.
12. Remote solenoid closed.
13. Airflow switch open.
14. Open circuit in radio noise filter.

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