How much does it cost to fix Ariston error code E 02?

Typical repair cost for the Ariston E 02 fault is £80-150 including labour.

E 02 High

Ariston E 02 Fault Code

Q: What does the Ariston E 02 fault code mean?

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to function safely.

Also written as E02 — same fault.

The Ariston E 02 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low to function safely.. It appears on 5 Ariston models in our database.

Technical description: Insufficient water pressure

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop (a silver flexi-hose) or internal filling key under the boiler.Gradually open the valve(s) to let mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valve(s) tightly and turn the boiler off and on again to clear the error.

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Ariston models that show the E 02 fault code

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

Source

Ariston E 02 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