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  Aircraft Maintenance TroubleShoot > Heater Troubleshooting (Cessna-crafted)

Heater fails to light

1. Heater switch or circuit breaker open.
2. Low voltage.
3. No fuel in system. Check fuel shutoff valve.
4. Insufficient fuel pressure caused by faulty fuel pump or no pump current.
5. Fuel nozzle clogged in heater.
6. Fuel heater solenoid not operating.
7. Fuel lines clogged or broken.
8. Fuel filter clogged.
9. Ignition vibrator inoperative.
10. Spark plug fouled.
11. Manual reset limit switch open. Press reset button and recheck to determine reason for switch opening.
12. Combustion air pressure switch open. (From defective switch or low combustion-air blower output.
13. Cycling switch open.
14. Thermostat switch open. Operate control to see if switch will come on. Replace switch if defective.
15. Heater switch OFF. Broken or loose wiring to motor.



 

 
 

 

 

 

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.