How much does it cost to fix Ariston error code 2 01?

Typical repair cost for the Ariston 2 01 fault is £120-200 including labour.

2 01 Medium

Ariston 2 01 Fault Code

Q: What does the Ariston 2 01 fault code mean?

Your boiler is struggling to detect the temperature of your hot water supply because a connection to one of its internal sensors has been lost.

Also written as 201 — same fault.

The Ariston 2 01 fault code means: your boiler is struggling to detect the temperature of your hot water supply because a connection to one of its internal sensors has been lost.. It appears on 2 Ariston models in our database.

Technical description: D.H.W. storage sensor circuit open / short circuit

Typical repair cost £120-200 (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 01 fault code

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

Source

Ariston 2 01 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