ER 18 + RESET High

Boiler Fault Code ER 18 + RESET

Also written as ER18RESET — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code ER 18 + RESET 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 has stopped working because water is not moving through the system properly, which could be due to a blockage or a pump issue. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the ER 18 + RESET fix

Johnson Starley ER 18 + RESET 1 model

Source

Information for the ER 18 + RESET 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