BoilerFaultCodesPotterton No neon illuminated Fault Code
Also written as NONEONILLUMINATED — same fault.
The Potterton No neon illuminated fault code means: your boiler has no power and the control panel lights are completely switched off.. It appears on 1 Potterton model in our database.
Technical description: Go to section ‘A’: Check 230V at main terminals L and N, main terminal fuse, and selector terminals.
What causes the Potterton No neon illuminated fault?
This fault occurs when the electrical supply to the boiler's internal components is interrupted, meaning the control board cannot receive any power. The most common reasons are a blown internal glass fuse caused by a component short-circuiting, a faulty main circuit board, or a failure in the power selector switch. Essentially, the 'brain' of the boiler has lost its electricity and cannot tell the system to start up.
DIY fix possible
Check if the boiler's power switch is turned onCheck your home's main fuse box/consumer unit to see if a circuit has trippedCheck the fuse in the spurred power socket next to the boiler
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Potterton models that show the No neon illuminated fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton No neon illuminated 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