What is wrong when your heater does not work?

When your heater doesn't work, it could be due to several issues such as a malfunctioning thermostat, a tripped circuit breaker, or a blown fuse. Additionally, the problem might stem from a lack of fuel (for gas heaters), a dirty filter obstructing airflow, or mechanical failures in the heating system itself. It's important to check these components before calling a professional for further diagnosis. Regular maintenance can also help prevent such issues.