During a boiler service, a qualified engineer performs a series of checks and tests to ensure that your boiler is operating safely and efficiently. Initially, they will visually inspect the boiler and its associated components to ensure they are in good condition. They’ll check the boiler for signs of corrosion or leaks, which could signify a problem. They will also confirm that the boiler is operating at the correct pressure and that the flame is the right color. The engineer will examine the boiler’s safety devices to confirm they’re functioning properly, and will inspect the flue to ensure it’s securely fitted and not blocked, and that it’s properly emitting the boiler’s exhaust gases. Inside the boiler, the engineer will clean any components as necessary to ensure they’re working efficiently, and replace any that are worn out. Finally, the engineer will run the boiler to check for any working issues. The entire process usually takes about an hour, depending on the type and condition of the boiler.