14 Emergency

Sime 14 Fault Code

The Sime 14 fault code means: your boiler has detected an issue with the sensor that monitors the air and fumes inside the unit, meaning it has safely shut itself down to prevent any risk.. It appears on 3 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: EXHAUST FUMES SENSOR ERROR
Typical repair cost £150-250 (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 14 fault code

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

Source

Sime 14 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