BoilerFaultCodesPotterton E55 Fault Code
The Potterton E55 fault code means: your boiler's internal computer has detected that its gas and air settings need recalibrating to ensure it burns fuel efficiently and safely.. It appears on 1 Potterton model in our database.
Technical description: Calibration required
What causes the Potterton E55 fault?
This fault occurs when the boiler's control system detects that the gas-to-air ratio has drifted outside of its safe operating limits. It usually happens because the sensors can no longer automatically adjust the combustion, often due to a failing gas valve, worn ignition electrodes, or a fault within the main circuit board.
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 E55 fault code
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Source
Potterton E55 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