neon flashing (Section I/M) High

Potterton neon flashing (Section I/M) Fault Code

Also written as NEONFLASHINGSECTIONIM — same fault.

The Potterton neon flashing (Section I/M) fault code means: your boiler is failing to stay lit because it cannot properly detect the flame or is struggling to drain away waste water, causing it to 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: Flame sensing fault / Burner extinguishes after 10 seconds / Condensate drain blockage
Typical repair cost £120-250 (including labour)

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 neon flashing (Section I/M) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton neon flashing (Section I/M) 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