Neon 1 Low

Protherm Neon 1 Fault Code

Also written as NEON1 — same fault.

The Protherm Neon 1 fault code means: your boiler is receiving power and is switched on, which is a normal status indicator rather than a fault.. It appears on 1 Protherm model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Main electrical supply to the boiler and heating system is on
Typical repair cost £0 (including labour)

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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Protherm models that show the Neon 1 fault code

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

Source

Protherm Neon 1 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