ALL 13 Emergency

Sime ALL 13 Fault Code

Also written as ALL13 — same fault.

The Sime ALL 13 fault code means: your boiler has detected that the gases produced during burning are not escaping properly, so it has safely shut down to prevent the build-up of dangerous fumes.. It appears on 6 Sime models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: ACTIVATION OF THE EXHAUST FUMES SENSOR ERROR
Typical repair cost £150-300 (including labour)

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 13 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Sime ALL 13 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026