A64 High

Euroterm A64 Fault Code

The Euroterm A64 fault code means: your boiler's main internal computer has developed a serious software or circuit error and can no longer control the heating safely.. It appears on 1 Euroterm model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Controller 041049G0 fault - Controller 041049G0 internal error
Typical repair cost £250-£450 (including labour)

Engineer required

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

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Euroterm models that show the A64 fault code

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

Source

Euroterm A64 fault code information on this page is sourced and cross-checked against the official Euroterm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026