How much does it cost to fix Ariston error code E 15?

Typical repair cost for the Ariston E 15 fault is £90-160 including labour.

E 15 Low

Ariston E 15 Fault Code

Q: What does the Ariston E 15 fault code mean?

Your boiler is struggling to read the temperature outside, which is usually due to a loose wire or a damaged sensor cable.

Also written as E15 — same fault.

The Ariston E 15 fault code means: your boiler is struggling to read the temperature outside, which is usually due to a loose wire or a damaged sensor cable.. It appears on 2 Ariston models in our database.

Technical description: Outdoor sensor open circuit (if fitted)

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 E 15 fault code

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

Euro Combi 30 MFFI Repair: £90-160
Euro Prisma 24 Repair: £90-160

Source

Ariston E 15 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