E05 High

Ariston E05 Fault Code

The Ariston E05 fault code means: your boiler's temperature sensor for hot water has developed an electrical fault, meaning the system cannot safely gauge how hot your water is and has stopped heating it.. It appears on 6 Ariston models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Domestic hot water temperature probe in short circuit
Typical repair cost £90-160 (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 E05 fault code

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

Source

Ariston E05 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 31 August 2026