Why is it important to check all limits and safeties during a tune-up?

Checking all limits and safeties during a tune-up is crucial to guarantee safe and reliable operation of the heating system. These limits and safety devices are designed to protect both the equipment and the occupants by preventing hazardous conditions, such as overheating or fuel leaks. If these components are not functioning properly, the system could operate unsafely, potentially leading to dangerous situations like fires or carbon monoxide exposure.

By ensuring that all safety mechanisms are in place and operational, technicians can proactively identify and rectify issues that could compromise safety. Additionally, this practice enhances the overall reliability of the heating system, thereby reducing the likelihood of failures during operation. This not only promotes a secure environment but also fosters trust in the heating system's performance.