BoilerFaultCodesSime AL 08 Fault Code
Also written as AL08 — same fault.
The Sime AL 08 fault code means: your boiler is having trouble sensing the flame required to stay lit, which means it will stop working to ensure your safety.. It appears on 22 Sime models in our database.
Technical description: Fault in the flame detection circuit — check ignition electrode; verify gas supply/pressure
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 AL 08: no call-out fees, no surprise bills.
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Sime models that show the AL 08 fault code
Click a model for the full fault code list and model-specific repair notes.
- Brava DGT HE Repair: £100-280
- Brava One HE Repair: £120-250
- Brava Slim HE Regular Repair: £100-280
- Brava Slim HE System Repair: £120-280
- Dewy 30/130 HE FS Repair: £100-£250
- Dewy 30/50 HE WM Repair: £120-280
- Ecomfort Plus HE EV Combi Repair: £120-280
- Ecomfort System Plus HE EV Repair: £100-280
- Format DGT HE Combi Repair: £100-280
- Format DGT HE System Repair: £120-£280
- Giulia Combi 30 Repair: £120-280
- Halstead Trio Repair: £100-£260
- iQE Comfort 30 Repair: £120-250
- Meridian HE Repair: £90-180
- Metropolis DGT 25 BF Repair: £90-220
- Mia 30 Repair: £0-80
- Murelle One HE Repair: £120-250
- Murelle Pro HE 25 HO Repair: £120-£280
- Murelle Pro HE Combi Repair: £120-£280
- Murelle Pro HE MkII Combi Repair: £120-280
- Murelle Pro HE R MkII System Repair: £120-280
- Murelle Pro HE System R Repair: £120-280
Source
Sime AL 08 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime Brava DGT HE manual (PDF)
- Sime Brava One HE manual (PDF)
- Sime Brava Slim HE System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026