How much does it cost to fix Potterton error code neon flashing (Section M)?

Typical repair cost for the Potterton neon flashing (Section M) fault is £150-300 including labour.

neon flashing (Section M) High

Potterton neon flashing (Section M) Fault Code

Q: What does the Potterton neon flashing (Section M) fault code mean?

Your boiler has automatically turned itself off because it has become too hot to operate safely.

Also written as NEONFLASHINGSECTIONM — same fault.

The Potterton neon flashing (Section M) fault code means: your boiler has automatically turned itself off because it has become too hot to operate safely.. It appears on 1 Potterton model in our database.

Technical description: Flue overheat thermostat operated

Typical repair cost £150-300 (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 M) fault code

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

Performa System HE Repair: £150-300

Source

Potterton neon flashing (Section 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 27 April 2026