F.057 High

Vaillant F.057 Fault Code

Also written as F057 — same fault.

The Vaillant F.057 fault code means: your boiler's electronic brain can no longer safely manage the fuel and air mixture required to burn gas, meaning it has shut down completely to prevent an unsafe condition.. It appears on 3 Vaillant models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Limphome mode failed. The combustion regulation has failed and the associated limp home mode has failed.
Typical repair cost £250-450 (including labour)

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.057 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vaillant F.057 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