BoilerFaultCodesMain E131 Fault Code
The Main E131 fault code means: your boiler has lost power while it was already trying to report a different error, meaning the system is currently confused and needs a manual reset to restart correctly.. It appears on 3 Main models in our database.
Technical description: Interruption Of Power Supply while in fault mode
DIY fix possible
Locate the reset button or dial on the front of your boiler control panel.Hold the reset button for 3 to 5 seconds until the display clears.Wait a few minutes to see if the boiler initiates a new start-up sequence.If the code returns, try switching the boiler off at the fused spur for 60 seconds before turning it back on.
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Main models that show the E131 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Main E131 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