How much does it cost to fix Atag error code 112?

Typical repair cost for the Atag 112 fault is £90-160 including labour.

112 High

Atag 112 Fault Code

Q: What does the Atag 112 fault code mean?

Your boiler's internal sensor that monitors the temperature of the water returning to the unit has failed or is giving an incorrect reading, causing the system to shut down for safety.

The Atag 112 fault code means: your boiler's internal sensor that monitors the temperature of the water returning to the unit has failed or is giving an incorrect reading, causing the system to shut down for safety.. It appears on 18 Atag models in our database.

Technical description: Return Probe Damaged

Typical repair cost £90-160 (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 112 fault code

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

Source

Atag 112 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 31 August 2026