How much does it cost to fix Atag error code Error 01?

Typical repair cost for the Atag Error 01 fault is £150-300 including labour.

Error 01 High

Atag Error 01 Fault Code

Q: What does the Atag Error 01 fault code mean?

Your boiler has detected an electrical short-circuit in its internal wiring, which has triggered an automatic safety shutdown to prevent further damage.

Also written as ERROR01 — same fault.

The Atag Error 01 fault code means: your boiler has detected an electrical short-circuit in its internal wiring, which has triggered an automatic safety shutdown to prevent further damage.. It appears on 8 Atag models in our database.

Technical description: short-circuit of 24 volt circuit

Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Atag models that show the Error 01 fault code

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

Source

Atag Error 01 fault code information on this page is sourced and cross-checked against the official Atag service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026