BoilerFaultCodesSime Orange LED on Fault Code
Also written as ORANGELEDON — same fault.
The Sime Orange LED on fault code means: your boiler is currently in standby mode and is waiting for a command to provide heating or hot water, meaning there is no actual fault.. It appears on 12 Sime models in our database.
Technical description: Stand-by / off — normal stand-by condition
DIY fix possible
Check if your room thermostat or programmer is turned up and calling for heatEnsure the boiler control knob is set to the summer or winter positionCheck that the external heating controls have working batteries
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Sime models that show the Orange LED on fault code
Click a model for the full fault code list and model-specific repair notes.
- Ecomfort HE Combi Repair: £0
- Ecomfort Plus HE Repair: £0
- Ecomfort System 25 HE Repair: £0
- Format B Combi Repair: £0
- Format C Combi Repair: £0
- Format HE Combi Repair: £0
- Format System HE Repair: £0
- Friendly Repair: £0
- iQE Comfort 30 Repair: £0
- Murelle HE System Repair: £0
- Planet Dewy BFR Repair: £0
- Planet Super 4 WM Repair: £0
Source
Sime Orange LED on fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime Ecomfort System 25 HE manual (PDF)
- Sime Ecomfort Plus HE manual (PDF)
- Sime Format B Combi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026