Learn what causes your house heater to stop working, from thermostat issues to airflow and ignition problems, plus when to call a pro.

If your heat furnace keeps shutting off, learn the common causes, what you can check safely, and when it’s time to call a licensed HVAC pro.

How do you fix a furnace that is not heating? Start with thermostat, filter, power, and airflow checks before calling for furnace repair.