BoilerFaultCodesPotterton Neon8 Fault Code
Also written as NEON8 — same fault.
The Potterton Neon8 fault code means: your boiler has lost track of the water temperature and has shut down as a safety precaution.. It appears on 1 Potterton model in our database.
Technical description: Fault on Temperature Sensor
What causes the Potterton Neon8 fault?
This fault occurs when the boiler's main control board stops receiving a consistent or accurate signal from the internal temperature sensor. The most common reason is that the sensor has physically failed or developed a short circuit, meaning the boiler can no longer safely monitor how hot the water is. In some cases, loose or damaged wiring between the sensor and the brain of the boiler can also trigger this shutdown.
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 Neon8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Neon8 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