BoilerFaultCodesSime AL 92 Fault Code
Also written as AL92 — same fault.
The Sime AL 92 fault code means: your boiler has shut down because it cannot balance the air and gas mixture properly while running at its lowest power setting.. It appears on 6 Sime models in our database.
Technical description: System has reached maximum air correction error (at the minimum flow rate)
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 92 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Sime AL 92 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 Dewy 30/130 HE FS manual (PDF)
- Sime Dewy 30/50 HE WM manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026