What preventative maintenance steps can help prevent future occurrences of Utica boiler error code 128?

Regular preventative maintenance includes ensuring the system pressure is consistently within the manufacturer's recommended range, bleeding air from the entire heating system annually, checking and cleaning the circulator pump and any strainers, verifying the expansion tank's charge and function, and ensuring all zone valves are operating correctly. An annual professional inspection can also identify potential issues with critical components like the high limit aquastat or circulator pump before they lead to a system shutdown.