BoilerFaultCodesViessmann F02 Fault Code
The Viessmann F02 fault code means: your boiler has likely overheated or a sensor has detected an electrical fault, causing the system to shut down for safety.. It appears on 1 Viessmann model in our database.
Technical description: Short circuit, flow temperature sensor or high limit temperature cut-out
DIY fix possible
Wait 20 minutes for the boiler to cool down naturally.Check that your radiator valves are open and not blocked.Press the 'Reset' button on the boiler control panel once to see if the error clears.
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Viessmann models that show the F02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann F02 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 7 July 2026