BoilerFaultCodesPotterton E128 Fault Code
The Potterton E128 fault code means: your boiler started to heat up but the flame unexpectedly went out, causing the system to stop working for safety.. It appears on 2 Potterton models in our database.
Technical description: Loss of flame during operation
DIY fix possible
Check that your gas prepay meter has creditCheck if other gas appliances, like a cooker, are workingReset the boiler by turning the selector switch to 'R' for five seconds
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Potterton models that show the E128 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E128 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 7 July 2026