BoilerFaultCodesSime ALL 06 Fault Code
Also written as ALL06 — same fault.
The Sime ALL 06 fault code means: your boiler has detected a serious internal fault that has caused it to shut down for safety reasons and it will not provide heating or hot water until a professional has inspected it.. It appears on 10 Sime models in our database.
Technical description: LOCKOUT ALARM
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like ALL 06: no call-out fees, no surprise bills.
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Sime models that show the ALL 06 fault code
Click a model for the full fault code list and model-specific repair notes.
- iQE Comfort 30 Repair: £150-350
- iQE Simplicity 20T Repair: £120-350
- Murelle Advanced HE Combi Repair: £120-250
- Murelle Advanced HE MkII Combi Repair: £120-250
- Murelle Elite HE 35T System Repair: £150-300
- Murelle Elite HE Combi Repair: £150-300
- Murelle HE Combi with Cylinder Repair: £120-250
- Murelle HE Regular Repair: £120-250
- Murelle HE System Repair: £120-250
- Murelle Revolution 30 Repair: £120-250
Source
Sime ALL 06 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime iQE Comfort 30 manual (PDF)
- Sime iQE Simplicity 20T manual (PDF)
- Sime Murelle Advanced HE Combi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026