• Check operation of safety limit controls
• Check operation of thermostat
• Lubricate blower motor and bearings as required
• Inspect blower assembly
• Check blower speed and operation
• Check pressure switches and vent blower
• Inspect burners and clean if required
• Examine vent connector and inspect venting system
• Check and adjust pilot light
• Check flame rectification
• Measure stack temperature
• Check gas piping to furnace
• Check air filters and reinstall
• Instruct customer on filter maintenance
• Clean equipment interior
• Check and adjust manifold gas pressure
• Ensure combustion and ventilation adequacy
• Check for elevated carbon monoxide levels
• Inspect heat exchanger
• Check Delta between supply and return air
• Clean equipment exterior
• Supply owner with comprehensive overview of furnace operation.