BoilerFaultCodesViessmann 38:0 Fault Code
Also written as 380 — same fault.
The Viessmann 38:0 fault code means: your boiler is reporting a normal status update rather than a failure, indicating that the internal burner control system is currently operating correctly.. It appears on 5 Viessmann models in our database.
Technical description: Burner control unit state (0=burner control unit OK)
What causes the Viessmann 38:0 fault?
This code appears as a status communication between the boiler's internal computer and the burner system. It indicates that the self-testing sequence has been completed successfully and the burner control unit is functioning exactly as it should. Because this is a positive status update rather than a malfunction, your boiler has not actually stopped working.
DIY fix possible
Check if the display returns to the home screen manuallyPerform a simple reset if the code persists on the displayMonitor for any other numerical codes that may appear alongside it
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Gas Safe Register →Viessmann models that show the 38:0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 38:0 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026