17 Medium

Sime 17 Fault Code

The Sime 17 fault code means: your boiler is momentarily pausing the flow of water to the radiators, likely because it is detecting an issue with the pump that pushes the water around your system.. It appears on 1 Sime model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Pump heating activation delay
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 17 fault code

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

Source

Sime 17 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