70°C neon flashing High

Potterton 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 1 Potterton model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Go to section ‘E’ - Air pressure switch proved fault.
Typical repair cost £150-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

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 27 April 2026