Get Your Oil Burner License | 2026 Certification Guide & Exam Prep

An Oil Burner License is a mandatory credential for any technician installing, servicing, or repairing oil-fired heating equipment, including furnaces, boilers, and water heaters. Unlike standard HVAC certifications, this license focuses specifically on combustion efficiency, fuel safety, and local fire codes. Whether you are an aspiring technician in New York, Massachusetts, Pennsylvania, or Maine—states with high heating oil usage—holding a valid license is non-negotiable for legal operation. Who Needs This License? Service Technicians: Anyone cleaning, tuning, or repairing oil burners. Installation Contractors: Professionals replacing oil tanks or upgrading burners. Homeowners (in some jurisdictions): Required for self-installation of oil appliances. Property Managers: Overseeing multi-family buildings with heating oil systems. OIL BURNER LICENSE NEWEST 2025 ACTUAL EXAM TEST BANK 410 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ (MASSACHUSETTS) 1. On a new oil furnace installation, the oil pump pressure is found to be 50 psi. Which of the following actions should be taken? The correct answer is: Increase the pump pressure. 2. After installation and 20 minutes of run time, and oil furnace is found to have CO2 of 8%. Which of the following could cause the low CO2 reading? The correct answer is: Excess primary air. 3. After achieving steady-state efficiency on an oil furnace, which of the following are the indications of good combustion? The correct answer is: 10 to 12% CO2 and #0 to #1 smoke. 4. On start-up of an oil unit, the technician's smoke test shows the unit to have a #8 smoke. Which of the following is the correct action that should be taken? The correct answer is: Increase primary air. 5. During a maintenance inspection, if a heavy coating of soot is present on the cad cell in the control system of an oil primary burner, after resetting the primary control the technician is most likely to discover that the: The correct answer is: Burner will start and run normal for a short time, then will lock out. 6. In regard to a residential oil heating furnace, temperature rise through the furnace is calculated by the formula: The correct answer is: Temperature of the indoor supply air minus temperature of the return air. 7. On a "no heat" service call for an oil-fired furnace, what is the main safety precaution that the technician must take before attempting to fire the oil furnace? The correct answer is: Check the combustion chamber for liquid oil. 8. A high vacuum reading in the oil supply line can indicate that: The correct answer is: A restriction is present in the oil line. 9. With an oil furnace disconnect switch off, for testing purposes a 1500 ohms resistor is inserted across both cad cell terminals on the primary control. When the power is turned back on, the burner starts and runs continuously. This indicates that: The correct answer is: The primary control is functioning properly. 10. A high cad cell resistance when the flame is present indicates: The correct answer is: Sooting of the cad cell face. 11. Upon resetting the primary control, the burner ignites and runs normally for about 45 seconds and then stops. Which one of the following is the most likely problem? The correct answer is: A dirty or faulty cad cell. 12. A residential oil burner runs with good flame for almost 1 minute but stops when the primary control locks out. Which of the following should you check? The correct answer is: Cad cell. 13. Which of the following is the best procedure for checking the operation of the cad cell? The correct answer is: Disconnect one cad cell lead from the primary. 14. Failure of the cad cell to view the oil-burner flame properly because of soot buildup or misalignment will result in which of the following symptoms during start-up? The correct answer is: Burner stops at the end of the lockout timing. 15. A customer is upset because the oil burner is causing high fuel bills. The technician finds the stack temperature to be very high, the CO2 level at 8% and no smoke present. Which of the following action should be taken to resolve this problem? The correct answer is: Reduce the primary air. 16. The secondary voltage on an oil-burner ignition transformer is approximately: The correct answer is: 10,000 volts.