BoilerFaultCodesAtag Block 82 Fault Code
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 7 Atag models in our database.
Technical description: The flue gas sensor has short-circuited, heat requirement blocked and pump capacity at minimum.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like Block 82: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
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 7 July 2026