Check for gas leakages

Inspect the boiler’s safety devices

Inspect the main gas line

Check the boiler’s control system for any defects

Check the boiler's pressure levels

Confirm optimal pressure level

Inspect flue and ventilation operation

Check the boiler's heating efficiency

Check for any signs of soot or corrosion

Conduct energy audit

Inspect the boiler's burner and flame sensors

Check the gaskets for signs of leaks

Perform a complete inspection of all internal components

Inspect all pipes and connections for signs of corrosion

Inspect the flue for any blockages

Clean the boiler internally and externally

Replace worn-out components if required

Lubricate moving parts

Check boiler insulation

Perform routine maintenance as per manufacturer's specifications

Check the boiler's fuel efficiency

Monitor flue gas temperatures

Inspect the heat exchanger for integrity and wear

Check the water quality in the boiler

Ensure compliance with relevant building and safety codes