How do you test an oil furnace ignition transformer?

To test an oil furnace ignition transformer, first ensure that the power to the furnace is turned off to prevent any electrical hazards. Remove the ignition transformer from its mounting, taking care to note the wiring connections for reassembly. Use a multimeter to check the primary winding by setting it to the ohms setting and testing the input terminals; a good transformer will show low resistance, typically between 1 to 10 ohms. Next, test the secondary winding by checking the high voltage terminal; it should show a significantly higher resistance, commonly in the kilo-ohm range. Additionally, if accessible, inspect for any visible signs of damage or corrosion on the transformer and its connections. Finally, if the transformer passes these tests but fails to ignite, it may require professional evaluation or replacement. Remember that an oil-free transformer can contribute to improved operational efficiency and reduce maintenance needs.