BoilerFaultCodesPotterton E29 Fault Code
The Potterton E29 fault code means: your boiler has detected an internal electrical connection problem that is preventing it from monitoring the system pressure correctly.. It appears on 1 Potterton model in our database.
Technical description: Fault in link on 6-way plug J11. Replace (pressure sensor) cable assy. Part No. 5107534
What causes the Potterton E29 fault?
This fault occurs when the boiler's main control board loses its physical electrical link with the water pressure sensor. It is typically caused by a loose connection at the plug or a break in the internal wiring harness that monitors the system's safety levels. Because the boiler can no longer verify if there is enough water to operate safely, it will shut down as a precaution.
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 E29 fault code
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Source
Potterton E29 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