• Check thermostat operation
• Check pilot ignition sequence (adjust pilot or replace thermocouple)
• Observe main burner operation
• Check flue draft on natural draft furnaces
• Test fan switch/heating fan relay option
• Check primary limit operation
• Cycle furnace off and record “fan off” temperature
• Visually inspect heat exchanger
• Check blower wheel for cleanliness
• Check blower motor, oil bearings if applicable, check belt, bearings and pulleys
• Check air filter/air cleaner (replace filter-standard 1″)
• Check furnace temperature rise
• Fire furnace, leak-check gas line from manual shut-off valve to main burners
• Check auxiliary limit switch operation
• Test draft safeguard switch position
• Perform combustion are test to ensure that there are enough ventilation to replace combustion air.
• Operating through one complete cycle
• Clean furnace cabinet
• Attach sticker/service tag
• Check humidifier operation
  • Water Panel
  • Solenoid Valve
  • Clean Tray
  • Drain
• Review pro-check heating performance results with customer
• Review any appropriate indoor air quality issues with customer
• Review service agreement with customer