Neon 3 High

Protherm Neon 3 Fault Code

Also written as NEON3 — same fault.

The Protherm Neon 3 fault code means: your boiler is trying to light itself, but it is failing to sense a flame and has stopped for safety.. It appears on 1 Protherm 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: Spark ignition is operating
Typical repair cost £120-280 (including labour)

Engineer required

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

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Protherm models that show the Neon 3 fault code

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

Source

Protherm Neon 3 fault code information on this page is sourced and cross-checked against the official Protherm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026