Fault Code Lookup

HVAC Sales Master
Current Alerts
Active alerts menu — shows currently active system alerts
This code typically points to

    Next checks to confirm
    1. Diagnostics menu → Current Alerts to view active alerts

    Escalation
    None
    Reset behavior
    Menu label.
    Informational
    No action needed
    Deeper detail available
    The manufacturer has pushed full per-code troubleshooting trees into the Trane Technician app. Use the app for subcode detail beyond what's shown here.
    Source
    XL1050 18-HD80D1-6F-EN, XL850 18-HD73D1-9E-EN