How much does it cost to fix Ferroli error code Safety thermostat activation?

Typical repair cost for the Ferroli Safety thermostat activation fault is £150-300 including labour.

Safety thermostat activation High

Ferroli Safety thermostat activation Fault Code

Q: What does the Ferroli Safety thermostat activation fault code mean?

Your boiler has detected that it is dangerously overheating because the water is failing to flow through the system as it should.

Also written as SAFETYTHERMOSTATACTIVATION — same fault.

The Ferroli Safety thermostat activation fault code means: your boiler has detected that it is dangerously overheating because the water is failing to flow through the system as it should.. It appears on 1 Ferroli model in our database.

Technical description: Outlet sensor not active; No system circulation

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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Ferroli models that show the Safety thermostat activation fault code

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

Econcept 100 Repair: £150-300

Source

Ferroli Safety thermostat activation fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026