What are the common causes of ignition failure in a furnace and how can it be resolved?

Common causes of ignition failure in a furnace include a faulty igniter, dirty or clogged burners, or a malfunctioning thermostat. To resolve this issue, you can try cleaning the burners, replacing the igniter, or adjusting the thermostat settings. If the problem persists, it is recommended to contact a professional HVAC technician for further diagnosis and repair.