BoilerFaultCodesPotterton 70°C neon flashing Fault Code
Also written as 70CNEONFLASHING — same fault.
The Potterton 70°C neon flashing fault code means: your boiler is failing to vent exhaust gases properly because it cannot confirm that the flue fan is working as it should, so it has shut down for safety.. It appears on 2 Potterton models in our database.
Technical description: Go to section ‘E’ - Air pressure switch proved fault.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Potterton models that show the 70°C neon flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 70°C neon flashing 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