BoilerFaultCodes 3.19 High
Boiler Fault Code 3.19
Also written as 319 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 3.19 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's control system has detected a fault with the primary circuit board, causing the unit to stop operating safely. (As reported on Johnson Starley Aquair S 10)
Pick your boiler brand for the 3.19 fix
Source
Information for the 3.19 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 7 July 2026