The answer to 'my tune-up keeps shutting off' is that there could be several common causes, such as a malfunctioning thermostat, issues with the electrical system, or problems with the HVAC unit itself. Symptoms may include the system turning on and off repeatedly, inconsistent temperatures, or a complete shutdown of the system.
Some potential solutions include checking the thermostat settings, inspecting the electrical connections, and cleaning or replacing air filters. However, if the issue persists, it's best to call a professional HVAC technician to diagnose and repair the problem. Attempting to fix complex HVAC issues on your own can be dangerous and may cause further damage to the system.