BoilerFaultCodesPotterton E85761 Fault Code
The Potterton E85761 fault code means: your boiler's internal pump has failed or is struggling to circulate water, meaning your heating and hot water will likely stop working.. It appears on 1 Potterton model in our database.
Technical description: Pump c/w auto air vent & 2 off washers
What causes the Potterton E85761 fault?
This fault occurs when the boiler's internal pump can no longer move water through the system effectively, often due to a mechanical failure or debris causing the pump to seize. It can also be triggered by a build-up of air within the unit that prevents the pump from gaining the necessary prime to circulate heat. If the pump cannot move the water, the boiler shuts down to prevent the internal heat exchanger from dangerously overheating.
This issue often surfaces in autumn when the heating is turned back on after being idle all summer, as stagnant water can cause pump components to seize.
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 E85761 fault code
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Source
Potterton E85761 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