Neon 3 Low

Ideal Neon 3 Fault Code

Also written as NEON3 — same fault.

The Ideal Neon 3 fault code means: your boiler is receiving electrical power and is currently sitting in standby mode waiting for a request to provide heating or hot water.. It appears on 3 Ideal models 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: Mains electricity ON.
Typical repair cost £0-80 (including labour)

DIY fix possible

Check that your room thermostat is turned up high enough to click onEnsure your programmer or timer is set to an 'ON' periodCheck that the boiler thermostat knob on the front panel is not turned to the 'O' or off position

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Ideal models that show the Neon 3 fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026