How much does it cost to fix boiler error code 18.64?

Typical repair cost for the boiler 18.64 fault is £120-250 including labour.

18.64 High

Boiler Fault Code 18.64

Also written as 1864 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 18.64 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 displaying a technical configuration code that indicates it is not currently set up to operate correctly for your home. (As reported on Glow-worm EnergySaver)

Pick your boiler brand for the 18.64 fix

Glow-worm 18.64 1 model

Source

Information for the 18.64 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 7 July 2026