BoilerFaultCodesPotterton E85762 Fault Code
The Potterton E85762 fault code means: your boiler has detected trapped air or a blockage in the internal pump system, which is preventing water from circulating properly to heat your home.. It appears on 1 Potterton model in our database.
Technical description: Automatic Air Vent
What causes the Potterton E85762 fault?
This fault occurs when air becomes trapped within the boiler's internal reservoir or the pump itself, creating an air lock that stops water flow. The most common reason is a failure of the automatic air vent to release gases, or a build-up of sludge that has blocked the internal de-aerator assembly.
This issue often surfaces in autumn when the heating is turned back on after summer, causing dormant air bubbles or settled debris to move into the pump system.
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 E85762 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E85762 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