BoilerFaultCodesPotterton neon illuminated Fault Code
Also written as NEONILLUMINATED — same fault.
The Potterton neon illuminated fault code means: your boiler is currently on and operating normally as part of its internal power check.. It appears on 3 Potterton models in our database.
Technical description: Burner on / Internal power check required (Section A)
What causes the Potterton neon illuminated fault?
This is not a mechanical failure but rather a status indicator showing the burner is active and the system is performing a routine internal power check. It confirms that the electrical components are working correctly and the boiler is successfully firing up to provide heat. You may see this light flicker or stay steady briefly while the boiler initiates its startup sequence.
DIY fix possible
No action is typically required as this is a status indicator rather than a fault.If the boiler fails to fire despite the light being on, check that your room thermostat is turned up.Ensure your gas supply is active and credit is on the meter.
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Potterton models that show the neon illuminated fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton neon illuminated fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
- Potterton Performa 24 manual (PDF)
- Potterton Performa 30 HE manual (PDF)
- Potterton Performa System HE manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026