BoilerFaultCodesViessmann 62:2 Fault Code
Also written as 622 — same fault.
The Viessmann 62:2 fault code means: your boiler's internal pump is running longer than expected to cool the system down, which may indicate a minor circulation issue or a sensor communication glitch.. It appears on 5 Viessmann models in our database.
Technical description: Circulation pump with 2 minutes run-on time
What causes the Viessmann 62:2 fault?
This fault occurs when the boiler's control system loses communication with the internal pump or detects that it isn't circulating water correctly. The most common reasons are a physical failure of the pump motor or a fault in the electronic signal between the pump and the main control board. When this happens, the boiler shuts down as a safety measure to prevent the internal components from overheating.
This issue is frequently seen at the start of autumn when a pump that has been inactive all summer becomes 'stuck' or seized upon the first demand for heating.
DIY fix possible
Check that all radiator valves (TRVs) are open to ensure water can circulate freely.Restart the boiler using the power button to see if the message clears.Ensure the system pressure gauge is between 1.0 and 1.5 bar.
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Gas Safe Register →Viessmann models that show the 62:2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann 62:2 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