When troubleshooting an oil furnace, the technician notices that the oil burner fires and burns normally for 90 seconds, and then shuts down. What is the most likely problem?

Question

Quizplus · Accepted Answer

A defective cad cell is the most likely problem in this scenario. The cad cell is responsible for detecting the presence of a flame in the oil burner. If the cad cell is defective, it may be sending the wrong message to the furnace control board, causing it to shut down the burner after 90 seconds even though the flame is still present.

When Troubleshooting an Oil Furnace, the Technician Notices That the Oil