BoilerFaultCodes 7.ii Emergency
Boiler Fault Code 7.ii
Also written as 7II — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 7.ii 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's internal pressure relief system has been triggered, meaning water is leaking out of a safety pipe outside your home because the pressure inside the system has become too high. (As reported on Chaffoteaux Celtic 2 24 Rsc)
Pick your boiler brand for the 7.ii fix
Source
Information for the 7.ii 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