How much does it cost to fix Sime error code P 15?

Typical repair cost for the Sime P 15 fault is £120-250 including labour.

P 15 High

Sime P 15 Fault Code

Q: What does the Sime P 15 fault code mean?

Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage.

Also written as P15 — same fault.

The Sime P 15 fault code means: your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage.. It appears on 1 Sime model in our database.

Technical description: High temperature (HP delivery temp. > 50°C)

Typical repair cost £120-250 (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 P 15 fault code

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

Murelle Revolution 30 Repair: £120-250

Source

Sime P 15 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.

Sime Murelle Revolution 30 manual (PDF)

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