How much does it cost to fix Atag error code 10?

Typical repair cost for the Atag 10 fault is £120-200 including labour.

10 Low

Atag 10 Fault Code

Q: What does the Atag 10 fault code mean?

Your boiler has lost the connection to the weather sensor outside your home, meaning it cannot automatically adjust your heating based on the outdoor temperature.

The Atag 10 fault code means: your boiler has lost the connection to the weather sensor outside your home, meaning it cannot automatically adjust your heating based on the outdoor temperature.. It appears on 5 Atag models in our database.

Technical description: Outside sensor error (e.g. open, short circuit, out of range)

Typical repair cost £120-200 (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 10 fault code

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

A200 Repair: £90-180
E Range Repair: £120-220
Q 25CR Repair: £100-200
S 25CR Repair: £120-200
Sov. Repair: £90-180

Source

Atag 10 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