BoilerFaultCodesPotterton E13 Fault Code
The Potterton E13 fault code means: your boiler has detected that water is still circulating or a sensor is stuck even when the pump should be off.. It appears on 4 Potterton models in our database.
Technical description: Differential water flow switch is still closed
What causes the Potterton E13 fault?
This fault occurs when the boiler's internal sensors believe water is still moving through the system even after the pump has been told to stop. This is usually caused by a mechanical sensor becoming stuck in the 'on' position due to debris in the system water, or a pump that is failing to switch off correctly. It acts as a safety measure to prevent the boiler from firing when it cannot accurately control the flow of water.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Potterton models that show the E13 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E13 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