How much does it cost to fix Atag error code 110?

Typical repair cost for the Atag 110 fault is £100-£350 including labour.

110 High

Atag 110 Fault Code

Q: What does the Atag 110 fault code mean?

Your boiler has shut down because it has detected an internal temperature that is too high, often caused by a lack of water circulation.

The Atag 110 fault code means: your boiler has shut down because it has detected an internal temperature that is too high, often caused by a lack of water circulation.. It appears on 4 Atag models in our database.

Technical description: Safety temperature exceeded

Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if your radiator valves are open to allow water to flow.Check your boiler pressure gauge and top it up to 1.5 bar if it is low.Restart the boiler using the reset button to see if the fault clears.

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Atag models that show the 110 fault code

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

Source

Atag 110 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