Vaillant F54 Fault Code

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.

Vaillant F54 / F.54 Fault Code

Meaning: This fault code suggests there is a fault in the gas supply. Usually this fault is accompanied by with a F.28 or F.29 Fault code.

Cause: According to Vaillant, there is insufficient gas supply to operate the unit. Gas isolator may be close on boiler or elsewhere. Also gas flow pressure may be too low.

Vaillant F54 / F.54 Fault Code Repair

The first and most simplest to check would be if the gas stop cock is fully open at the meter, near the boiler and anywhere else there may be any additional stop cocks.

Next would be to check if the check valve is working as it should. Solenoid testing equipment and multimeters may be required. If found faulty a replacement gas valve would be required.

See the video below to show the Vaillant F28 and F54 fault code and how to possibly resolve this fault.