BoilerFaultCodes E16, E17, E18 High
Boiler Fault Code E16, E17, E18
Also written as E16E17E18 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E16, E17, E18 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because its internal temperature sensors are giving conflicting readings or appear to be stuck, causing the system to shut down for safety. (As reported on Johnson Starley Warmaheat)
Pick your boiler brand for the E16, E17, E18 fix
Source
Information for the E16, E17, E18 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