How much does it cost to fix boiler error code UU/FF?

Typical repair cost for the boiler UU/FF fault is £120-250 including labour.

UU/FF High

Boiler Fault Code UU/FF

Also written as UUFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code UU/FF appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to detect a flame, which means it cannot safely light or stay running to provide you with heat and hot water. (As reported on Ariston Genus 24 MFFI)

Pick your boiler brand for the UU/FF fix

Ariston UU/FF 1 model

Source

Information for the UU/FF fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026