BoilerFaultCodesMain E119 Fault Code
The Main E119 fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.. It appears on 3 Main models in our database.
Technical description: Water Pressure Switch Not Operated
DIY fix possible
Locate the external filling loop, usually a silver braided hose near the boilerSlowly open the valves on the loop to allow mains water into the heating systemWatch the pressure gauge on the front of the boiler until the needle reaches between 1.0 and 1.5 barClose both valves tightly and remove the filling loop if required
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Gas Safe Register →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 27 April 2026