The answer to 'boiler not working' is that there can be several common causes, including a pilot light issue, low water pressure, thermostat problems, or a malfunctioning boiler component. Symptoms may include no heat, strange noises, or the boiler not turning on at all.
For minor issues, homeowners may be able to troubleshoot and fix the problem themselves, such as relighting the pilot light or resetting the thermostat. However, for more complex problems or if you're not comfortable working with the boiler, it's best to call a professional HVAC technician to diagnose and repair the issue.