FIL Medium

Vokera FIL Fault Code

The Vokera FIL fault code means: your boiler has detected that the internal components responsible for transferring heat need professional cleaning to restore efficiency.. It appears on 7 Vokera models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Clean primary heat exchanger
Typical repair cost £150-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vokera models that show the FIL fault code

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

Source

Vokera FIL fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026