BoilerFaultCodesPotterton E11 Fault Code
The Potterton E11 fault code means: your boiler's computer brain has encountered a serious internal error and can no longer control the heating system safely.. It appears on 2 Potterton models in our database.
Technical description: Internal control fault
What causes the Potterton E11 fault?
This fault occurs when the boiler's main control board suffers a hardware failure and is no longer able to process signals or manage safety checks. The most common reason is that age and electrical wear have caused the internal components of the circuit board to degrade or short-circuit. Because the brain of the boiler can no longer verify it is operating safely, it shuts down the system entirely as a protective measure.
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 E11 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E11 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