E02 078 High

Ariston E02 078 Fault Code

Also written as E02078 — same fault.

The Ariston E02 078 fault code means: your boiler is failing to light properly, which means the system cannot create the flame needed to heat your home or water.. It appears on 2 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: Main burner
Typical repair cost £120-350 (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 E02 078 fault code

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

Source

Ariston E02 078 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 7 July 2026