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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: February 7, 2024. Updated: May 17, 2024

F54 Vaillant Fault Code – How to fix

The Vaillant boiler F54 fault code indicates insufficient gas supply. This prevents flame ignition and so disables heating and hot water.

Understanding the F54 Fault Code

An F54 error signifies that your Vaillant boiler is not receiving the required gas to ignite the flame, leading to a lack of heating and hot water.

It often appears with F28/F29 codes, signifying flame failure. DIY solutions are limited to checking external gas valves; internal issues need a Gas Safe registered engineer. Boiler costs vary by type, with boiler financing options available for new boiler replacements.

Causes and DIY Fixes

The primary cause of an F54 fault is issues with the gas valve. This may be improperly closed or malfunctioning, especially in older Vaillant EcoTec models.

Other potential causes include low gas flow pressure, a general gas supply fault, or PCB failure. Homeowners can check and open external gas stopcocks, but any internal adjustments or replacements require a professional.

Professional Help and Costs

Resolving an F54 fault typically necessitates hiring a Gas Safe registered engineer. Costs vary based on the nature of the problem and location. Prices range from simple checks of gas stopcocks to more expensive repairs like PCB replacement. These errors can even require a full boiler replacement.

Warranty Coverage

Vaillant warranties may cover repairs or replacements if the fault stems from a manufacturing defect. It’s essential to ensure your warranty is active and meets specific conditions, including annual servicing by a Gas Safe registered engineer.


The F54 fault code can seem daunting. Understanding its causes and the appropriate steps for resolution can demystify the process and ensure your heating system returns to normal operation with minimal disruption.

Ensuring regular maintenance and being aware of your boiler’s warranty terms can also help in managing and potentially avoiding such issues in the future.

Unfortunately, your boiler may be unrepairable. If this is the case, get a boiler replacement quote for a premium boiler with Boilerhut:

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