BoilerFaultCodesPotterton E131 Fault Code
The Potterton E131 fault code means: your boiler has experienced a power cut or was switched off while it was already showing a different fault, causing it to lock itself out for safety.. It appears on 3 Potterton models in our database.
Technical description: Interruption Of Power Supply while in fault mode
What causes the Potterton E131 fault?
This fault occurs when the boiler loses electrical power—either due to a local power cut or someone switching off the fused spur—while it was already struggling with a different internal issue. Because the boiler was interrupted while trying to process an existing error, it enters a protective 'lockout' state to prevent you from accidentally running the system in an unsafe condition. It effectively gets stuck in a loop between the old error and the sudden loss of power.
DIY fix possible
Locate the selector switch on the front of the boilerTurn the switch to the 'R' (Reset) position and hold it for at least five secondsTurn the switch back to the 'On' position and wait to see if a different fault code appears
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Gas Safe Register →Potterton models that show the E131 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E131 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026