Self-diagnostics allow the unit to monitor its own health and display specific error codes if a problem is detected. This feature is standard on all Bravo Milano 24,000 BTU Universal Floor/Ceiling units to simplify repairs. In a Multi-Zone system, the codes can tell you if a specific valve or fan motor needs attention. We provide a full guide to these codes in the Accessories documentation provided with every purchase. This takes the guesswork out of troubleshooting for either the homeowner or a professional technician. For those in remote areas, this feature ensures that you can relay the exact problem to a tech before they even arrive. It is a vital part of maintaining the high reliability of the Single-Zone series.