🔍 Key Concepts

• Boiler burner safety interlocks and what conditions cause the fuel oil solenoid to de‑energize and close • Purpose and operation of the flame scanner during the ignition trial period • Effect of forced draft air failure on burner safety shutdowns

💭 Think About

• Think about what has to be proven safe before the control system will keep the fuel oil solenoid valve energized after you attempt to light off the burner. • Ask yourself: if there is no sustained flame detected, what does the burner management system do to the fuel oil solenoid? • Consider which option actually matches how a solenoid valve works: what happens to the valve position when the coil is energized versus de‑energized?

✅ Before You Answer

• Verify which conditions will cause a flame failure trip, resulting in loss of power to the fuel oil solenoid coil. • Check your understanding of how a solenoid valve operates: is it held open or held closed when energized in a burner fuel system? • Confirm which choices describe a realistic control or safety response, and eliminate those that conflict with basic solenoid and boiler safety logic.