BoilerFaultCodesSime ALL 41 Fault Code
Also written as ALL41 — same fault.
The Sime ALL 41 fault code means: your boiler has attempted to ignite several times but has failed to keep the flame running, so it has safely shut itself down to prevent gas from building up.. It appears on 3 Sime models in our database.
Technical description: Flame loss more than 6 consecutive times
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Sime models that show the ALL 41 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Sime ALL 41 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime Murelle Advanced HE Combi manual (PDF)
- Sime Murelle Advanced HE MkII Combi manual (PDF)
- Sime Murelle Revolution 30 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026