TRUE/FALSE: When operating the heat system, ensure all lower duct heat air nozzles are completely open. Any other configuration may cause illumination of the HEATER O/HEAT warning light.

TRUE/FALSE: When operating the heat system, ensure all lower duct heat air nozzles are completely open. Any other configuration may cause illumination of the HEATER O/HEAT warning light.

• A. True
• B. False
• C. Not applicable
• D. Not determinable

Answer: (A)

Airflow through the lower duct heat air nozzles must be unobstructed when the heat system is in use. The heater control relies on a defined airflow path to regulate temperature and to monitor for faults. When every lower nozzle is fully open, the system sees the intended flow, allowing correct heat delivery and preventing false fault detection. If any nozzle is not fully open, the restricted flow can be interpreted by the system as an abnormal condition (improper airflow or overheating), which can trigger the HEATER O/HEAT warning light. In short, full opening of the lower duct nozzles ensures proper operation and avoids unnecessary warning illumination.

Airflow through the lower duct heat air nozzles must be unobstructed when the heat system is in use. The heater control relies on a defined airflow path to regulate temperature and to monitor for faults. When every lower nozzle is fully open, the system sees the intended flow, allowing correct heat delivery and preventing false fault detection.

If any nozzle is not fully open, the restricted flow can be interpreted by the system as an abnormal condition (improper airflow or overheating), which can trigger the HEATER O/HEAT warning light. In short, full opening of the lower duct nozzles ensures proper operation and avoids unnecessary warning illumination.