2 02 Medium

Ariston 2 02 Fault Code

Also written as 202 — same fault.

The Ariston 2 02 fault code means: your boiler is struggling to read the temperature of the water in your separate storage tank because the sensor responsible for checking it has a loose connection or a faulty reading.. It appears on 8 Ariston models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Bottom storage temperature probe open / short circuit
Typical repair cost £120-220 (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 2 02 fault code

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

Source

Ariston 2 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 7 July 2026