BoilerFaultCodesSime AL 96 Fault Code
Also written as AL96 — same fault.
The Sime AL 96 fault code means: your boiler has detected a blockage or restriction in the flue pipe which is preventing exhaust gases from escaping safely, causing the system to shut down.. It appears on 13 Sime models in our database.
Technical description: Lockout due to flue (exhaust) blockage / smoke outlet clogged — inspect and clear flue system
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 AL 96 fault code
Click a model for the full fault code list and model-specific repair notes.
- Brava One HE Repair: £100-250
- Brava Slim HE Regular Repair: £100-250
- Brava Slim HE System Repair: £100-250
- Dewy 30/130 HE FS Repair: £100-250
- Dewy 30/50 HE WM Repair: £90-180
- Halstead Trio Repair: £100-250
- Mia 30 Repair: £100-280
- Murelle One HE Repair: £100-250
- Murelle Pro HE 25 HO Repair: £100-250
- Murelle Pro HE Combi Repair: £100-250
- Murelle Pro HE MkII Combi Repair: £100-250
- Murelle Pro HE R MkII System Repair: £90-250
- Murelle Pro HE System R Repair: £100-250
Source
Sime AL 96 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime Brava One HE manual (PDF)
- Sime Brava Slim HE System manual (PDF)
- Sime Dewy 30/130 HE FS manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026