Why your heating furnace will not come on?

There are several reasons why your heating furnace may not come on. Common issues include a tripped circuit breaker, a blown fuse, or a malfunctioning thermostat. Additionally, the furnace may have run out of fuel (for oil or gas furnaces) or could have a dirty air filter that restricts airflow. It's advisable to check these elements first before calling a technician for further diagnosis.