E131 Medium

Main 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 1 Main model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Interruption Of Power Supply while in fault mode
Typical repair cost £80-£150 (including labour)

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 27 April 2026