How is an ignition transformer for an oil furnace selected and maintained?

Selection starts with matching the primary voltage, mounting format, duty rating, and required secondary output voltage and current. Compatibility with the burner control and ignition method is essential. Maintenance includes inspecting wiring, terminals, insulation, and signs of overheating or cracking. Spark quality is verified by checking electrode condition and gap. If ignition becomes unreliable or the transformer shows insulation breakdown, replacement is often safer than repair. Keeping the burner area dry and clean reduces stress and extends life.