BoilerFaultCodesPotterton E85753 Fault Code
The Potterton E85753 fault code means: your boiler's internal valve is unable to switch between heating your radiators and providing hot water, likely because the motor controlling it has failed.. It appears on 1 Potterton model in our database.
Technical description: Actuator Head
What causes the Potterton E85753 fault?
This fault occurs when the small electric motor responsible for moving the internal valve becomes jammed or fails electrically. Over time, the internal components can wear out or become stuck due to debris in the heating water, preventing the boiler from switching between heating your home and warming your water.
This fault often becomes apparent during the first cold spell of autumn when the boiler is suddenly required to switch frequently between hot water and central heating modes.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Potterton models that show the E85753 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E85753 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