How much does it cost to fix Atag error code Error 03?

Typical repair cost for the Atag Error 03 fault is £150-300 including labour.

Error 03 High

Atag Error 03 Fault Code

Q: What does the Atag Error 03 fault code mean?

Your boiler has detected that the internal components are getting too hot, so it has safely shut itself down to prevent any damage.

Also written as ERROR03 — same fault.

The Atag Error 03 fault code means: your boiler has detected that the internal components are getting too hot, so it has safely shut itself down to prevent any damage.. It appears on 2 Atag models in our database.

Technical description: temperature in airbox to high

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 03 fault code

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

E Range Repair: £150-300
Premier Repair: £150-300

Source

Atag Error 03 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