- Check for carbon monoxide
- Check thermostat calibration
- Clean ignition assembly
- Test starting capabilities
- Change water sight glass*
- Monitor flue draft
- Check flue pipe (for leaks)
- Vacuum out chimney base
- Vacuum out main burners
- Test all safety controls
- Tighten electrical connections
- Check gas pressure
- Check burner flames output
- Check pilot light flame
- Check thermo coupling
- Lubricate all moving parts
- Check low water cut off*
- Check pressure control
- Check water feeder*
- Check return line (in site only)
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- Check boiler sections (in site only)
- Check switch relays
- Check transformers
- Check drain out valves
- Check carbon monoxide spill switch
- Check end of the line air valve*
- Check bleeder valves**
- Check safety roll of switch
- Check circulator pump**
- Check water flow valve**
- Check circulator pump flanges**
- Check chimney base connection
- Check back flow preventer
- Check emergency switch
- Check aquastat
- Check flu damper
- Water level sight glass/valves*
- Check air level in boiler room
- Emergency valves tags on water, gas and drain shut off valves
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