A code needs its appliance context
Keep the complete message with the model identification and the event that triggered it. 'An error during preheat' and 'an error at the end of a wash' give the service request a clearer direction than a code copied without context.
Separate connectivity from operation
If an app reports the appliance offline, check what you can already observe at the appliance itself. Tell us whether it still cools, cooks or washes through its own controls. A connection issue and an operating failure may be separate concerns.
Include the cabinet arrangement
Thermador equipment may be installed with custom fronts or alongside other built-in units. Mention a door that rubs, a control hidden by its position or a restricted opening. Keep trim and connections in place until access has been considered.
