Which statement best describes a boiler trip on loss of flame and a typical troubleshooting approach?

• A. Overheating due to a high feedwater rate causing emergencies.
• B. Overpressure trip due to a faulty relief valve that never opens.
• C. Low water level trip due to underfeed conditions.
• D. Loss of flame due to ignition failure, gas supply, or flame sensor fault; troubleshoot gas supply, ignition system, fuel valve, and flame safeguard.

Answer: (D)