BoilerFaultCodesIdeal Classic Se Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Regular Natural Gas 9-30 kW 2003-2005 Discontinued
GC Numbers 41-397-6341-397-6441-397-6541-397-6841-397-6941-397-7041-397-71
Replaced by: Classic HE
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Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-397-63 | Classic SE9 FF Silver | 2003–2005 |
| 41-397-64 | Classic SE12 FF Silver | 2003–2005 |
| 41-397-65 | Classic SE15 FF Silver | 2003–2005 |
| 41-397-68 | Classic SE18 FF Silver | 2003–2005 |
| 41-397-69 | Classic SE21 FF Silver | 2003–2005 |
| 41-397-70 | Classic SE24 FF Silver | 2003–2005 |
| 41-397-71 | Classic SE30 FF Silver | 2003–2005 |
Status & diagnostic codes 4 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
4 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
I3 Status Your boiler is simply showing that it has a stable power supply and is ready to operate as normal. Neon I3 Status Your boiler is receiving power, but this indicator light is just confirming that the electrical supply is turned on and the system is in standby. Neon SG1 Status Your boiler is currently trying to light its flame, which is a normal part of the start-up process that should stop once the burner is running. SG1 Status This code simply confirms that your boiler is currently in the process of lighting the flame, and it should disappear as soon as the burner is successfully ignited.