How much does it cost to fix Atag error code Block 80?

Typical repair cost for the Atag Block 80 fault is £120-250 including labour.

Block 80 High

Atag Block 80 Fault Code

Q: What does the Atag Block 80 fault code mean?

Your boiler has automatically paused its operation because the exhaust fumes inside the unit have become too hot, and it will try to start again once it has cooled down sufficiently.

Also written as BLOCK80 — same fault.

The Atag Block 80 fault code means: your boiler has automatically paused its operation because the exhaust fumes inside the unit have become too hot, and it will try to start again once it has cooled down sufficiently.. It appears on 8 Atag models in our database.

Technical description: Maximum flue gas temperature has been exceeded (if present). The block will not be cancelled until the flue gas temperature has arrived below the temperature.

Typical repair cost £120-250 (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 Block 80 fault code

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

Source

Atag Block 80 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