BoilerFaultCodesMain Indicator Neons Fault Code
Also written as INDICATORNEONS — same fault.
The Main Indicator Neons fault code means: your boiler is displaying warning lights to signal an internal fault that is preventing it from operating correctly.. It appears on 2 Main models in our database.
Technical description: Used to monitor the boiler operation and identify potential fault conditions as part of the Fault Finding section (detailed in Section 13.0).
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Main models that show the Indicator Neons fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Main Indicator Neons fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026