How much does it cost to fix Atag error code Block 82?

Typical repair cost for the Atag Block 82 fault is £150-250 including labour.

Block 82 High

Atag Block 82 Fault Code

Q: What does the Atag Block 82 fault code mean?

Your boiler has detected a faulty sensor that monitors exhaust fumes, so it has purposefully shut down for safety reasons until the part can be replaced by a qualified engineer.

Also written as BLOCK82 — same fault.

The Atag Block 82 fault code means: your boiler has detected a faulty sensor that monitors exhaust fumes, so it has purposefully shut down for safety reasons until the part can be replaced by a qualified engineer.. It appears on 8 Atag models in our database.

Technical description: The flue gas sensor has short-circuited, heat requirement blocked and pump capacity at minimum.

Typical repair cost £150-250 (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 82 fault code

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

Source

Atag Block 82 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