The answer to 'why is my boiler not working' is that there could be several common causes, such as a lack of fuel, a problem with the thermostat, or a mechanical issue with the boiler itself. Symptoms may include the boiler not turning on, inconsistent or insufficient heating, or strange noises coming from the unit.
Some potential solutions include checking the fuel supply, adjusting the thermostat, and inspecting the boiler for any visible damage or wear. However, if you're not comfortable troubleshooting the issue yourself, it's best to call a professional HVAC technician who can properly diagnose and repair the problem.