Ideal Classic HE 18 Fault codes & diagnostics

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

Natural Gas 2005-2011 Discontinued

GC Number 41-421-46

Download the Ideal Classic HE 18 manualThe official installation and service manual (PDF). PDF

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.