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  • Calibrate thermostat
  • Test safety control
  • Check burner assembly, clean and adjust as necessary
  • Check for combustion air
  • Inspect heat exchanger for cracking, rusting, or flaking
  • Check carbon monoxide levels
  • Test and clean ignition assembly
  • Check starting capabilities
  • Make sure flue is drafting properly
  • Check for proper air flow throughout system
  • Inspect electrical connections and check volts and amps
  • Adjust gas pressure and pilot, if needed
  • Check gas piping for any leaks
  • Make sure all moving parts are lubricated and moving freely
  • Detect any irregularities in heating cycle
  • Inspect blower assembly
  • Check condensate drains
  • Gauge temperature differences between supply air and return air
  • Inspect equipment area and clearances