Ideal Classic HE Fault codes & diagnostics

0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Regular LPGNatural Gas 15-18 kW 2003-2007 Discontinued

Replaced by: Logic Heat

Choose your boiler type

The Classic HE range comes in 10 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

SE9 RS 0 codes · 1 GC number SE12 RS 0 codes · 1 GC number SE15 RS 0 codes · 1 GC number SE18 RS 0 codes · 1 GC number HE 9 0 codes · 1 GC number HE 12 0 codes · 1 GC number HE 15 0 codes · 1 GC number HE 18 0 codes · 1 GC number HE 15 P 0 codes · 1 GC number HE 18 P 0 codes · 1 GC number

Each model has its own manual A family spans several manuals, one per model or generation. Pick your model above and its page has the manual its fault codes were read from.

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Status & diagnostic codes

2 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Neon I3 Status Your boiler has electrical power and is currently functioning normally, as this light simply indicates the mains power is switched on. Neon SG1 Status Your boiler is currently trying to light the flame and this light will go off once the burner has started successfully.