Atag Block 11 Fault Code

Also written as BLOCK11 — same fault.

The Atag Block 11 fault code means: your boiler has detected that the water inside is heating up much too quickly compared to how fast it is moving around your pipes, so it has temporarily paused your heating to prevent internal damage.. It appears on 6 Atag models in our database.

Technical description: Maximum (Δ)T of flow and return sensor in central heating has repeatedly been exceeded. During the block normal operation of the hot water supply is possible. The pump continues to operate at minimum capacity during the block.