BoilerFaultCodes 7.iv High
Boiler Fault Code 7.iv
Also written as 7IV — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 7.iv 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 developed an internal leak between its two water systems, causing the pressure to rise and trigger a safety release valve. (As reported on Chaffoteaux Sterling FF)
Pick your boiler brand for the 7.iv fix
Source
Information for the 7.iv 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