How can I troubleshoot an oil furnace transformer?

To troubleshoot an oil furnace transformer, first ensure that the power supply is functioning correctly and that the circuit breaker is not tripped. Check for any visible signs of damage or leaks in the transformer oil. Use a multimeter to measure the voltage output of the transformer; it should match the specifications. If the transformer is not operating correctly, consider testing the primary and secondary windings for continuity and insulation resistance.