BoilerFaultCodesPotterton E04 Fault Code
The Potterton E04 fault code means: your boiler is repeatedly starting up and then losing its flame, causing the heating and hot water to become unreliable.. It appears on 4 Potterton models in our database.
Technical description: Frequent loss of flame
What causes the Potterton E04 fault?
This fault occurs when the boiler successfully lights but cannot maintain a stable flame, causing the system to shut down for safety. The most common reason is a worn or dirty sensing probe that can no longer detect the fire, though it can also be caused by an inconsistent gas supply or a failing internal control board. Because the boiler keeps 'dropping' the flame, it eventually gives up and stops trying to provide heat.
This fault can be more frequent during very cold snaps if the external gas regulator or pipework is affected by freezing temperatures, leading to those inconsistent pressure drops.
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 E04 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E04 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