How much does it cost to fix Ariston error code E56?

Typical repair cost for the Ariston E56 fault is £120-200 including labour.

E56 High

Ariston E56 Fault Code

Q: What does the Ariston E56 fault code mean?

Your boiler has lost its ability to measure the temperature of the water circulating through your radiators, so it has safely shut down to prevent overheating.

The Ariston E56 fault code means: your boiler has lost its ability to measure the temperature of the water circulating through your radiators, so it has safely shut down to prevent overheating.. It appears on 3 Ariston models in our database.

Technical description: Heating flow temperature probe in open circuit

Typical repair cost £120-200 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the E56 fault code

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

Genus 24 MFFI Repair: £120-200
Genus 27 Repair: £90-160
Genus Premium Repair: £90-160

Source

Ariston E56 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

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