The answer to 'maintenance not heating' is that there are several common causes for a heating system that is not functioning properly, including issues with the thermostat, pilot light, air filters, or other components. Symptoms may include the system not turning on at all, blowing cold air, or not reaching the desired temperature.
Some DIY troubleshooting steps homeowners can try include checking the thermostat settings, replacing air filters, and ensuring the pilot light is lit. However, for more complex issues or if the problem persists, it's best to call in a professional HVAC technician to diagnose and repair the system.