BoilerFaultCodesIdeal Neon1 Fault Code
Also written as NEON1 — same fault.
The Ideal Neon1 fault code means: your boiler has detected that the internal fan or air pressure system is sticking in the 'on' position, preventing the ignition sequence from starting safely.. It appears on 2 Ideal models in our database.
Technical description: Air pressure switch made.
What causes the Ideal Neon1 fault?
This fault occurs when the boiler's safety system detects that the air pressure switch is already closed before the fan has even started. It is usually caused by the internal switch being physically stuck or the small sensing tubes becoming blocked with debris or moisture. Because the boiler cannot confirm a fresh flow of air is starting from scratch, it stops the ignition process as a safety precaution.
This issue can be more frequent in autumn and winter, as increased moisture and condensation within the flue pipes can settle in the pressure tubes and cause the switch to malfunction.
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 →Ideal models that show the Neon1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Neon1 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