Neon 2 Low

Protherm Neon 2 Fault Code

Also written as NEON2 — same fault.

The Protherm Neon 2 fault code means: your boiler is currently set to provide heating and is working to reach the temperature you have selected on the control dial.. 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: Boiler thermostat knob turned to a setting calling for heat (up to 82oC/180oF)
Typical repair cost £0 (including labour)

DIY fix possible

Check that your room thermostat is turned up to a higher temperature than the current room heatEnsure the boiler thermostat knob is turned to your desired heat levelMonitor the boiler to see if it reaches temperature and the light turns off naturally

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Protherm models that show the Neon 2 fault code

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

Source

Protherm Neon 2 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