BoilerFaultCodesVaillant F.92 Fault Code
Also written as F92 — same fault.
The Vaillant F.92 fault code means: your boiler has detected that the fuel type it is being supplied with does not match its internal settings, causing it to shut down for safety.. It appears on 5 Vaillant models in our database.
Technical description: Incorrect gas type (referenced in status code S.61)
What causes the Vaillant F.92 fault?
This fault occurs when the boiler's internal sensors detect that the gas being burned does not match the settings programmed into the control board. The most common reason is a communication error or mechanical failure within the gas valve or the venturi assembly, which prevents the boiler from regulating the fuel mix correctly. In some cases, it can be triggered after a new installation if the engineer has not correctly configured the boiler for the specific type of gas in your area.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vaillant models that show the F.92 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant F.92 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026