How much does it cost to fix Potterton error code neons flashing (Section D)?

Typical repair cost for the Potterton neons flashing (Section D) fault is £250-450 including labour.

neons flashing (Section D) High

Potterton neons flashing (Section D) Fault Code

Q: What does the Potterton neons flashing (Section D) fault code mean?

Your boiler has detected that the internal fan responsible for safely exhausting fumes is not rotating or working correctly, so it has shut down to keep your home safe.

Also written as NEONSFLASHINGSECTIOND — same fault.

The Potterton neons flashing (Section D) fault code means: your boiler has detected that the internal fan responsible for safely exhausting fumes is not rotating or working correctly, so it has shut down to keep your home safe.. It appears on 2 Potterton models in our database.

Technical description: Fan speed check - Fan jammed or faulty winding or primary temperature sensor faulty (resistance approx 11K ohms).

Typical repair cost £250-450 (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 neons flashing (Section D) fault code

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

Source

Potterton neons flashing (Section D) 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