BoilerFaultCodes ci range High
Boiler Fault Code ci range
Also written as CIRANGE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ci range appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an internal fault with its control board or electronic circuit, meaning it cannot operate safely and has shut down. (As reported on Glow-worm 30cxi)
Pick your boiler brand for the ci range fix
Source
Information for the ci range 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 27 April 2026