BoilerFaultCodesMain E119 Fault Code
The Main E119 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.. It appears on 7 Main models in our database.
Technical description: Water Pressure Switch Not Operated
DIY fix possible
Locate the filling loop (usually a silver braided hose under the boiler)Open the valves to allow mains water into the system until the pressure gauge reads between 1.0 and 1.5 barClose the valves tightly and restart the boiler
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Main models that show the E119 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Main E119 fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026