Planned maintenance is the best way to avoid unnecessary expense and inconvenience. Have this system inspected at regular intervals by a trained and experienced service technician. The following service intervals are typical for average situations but will have to be adjusted to suit your particular circumstances.
Fuel pressure settings, control settings, and linkage adjustments should be made only by persons thoroughly experienced with the burner and control system, and must not be tampered with by persons without such experience.
Always replace covers on burner controls and boxes as the electrical contacts are sensitive to dust and dirt. Perform maintenance of flame safeguard, controls, gas valves, and other such components in accordance with instructions contained in the manufacturer’s bulletins
Source: MaintainX (Community Member)