114 Low

Atag 114 Fault Code

The Atag 114 fault code means: your boiler has lost connection with the sensor outside that monitors the weather, which may cause your heating to run at the wrong temperature.. It appears on 18 Atag models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Outdoor Sensor 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 114 fault code

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

Source

Atag 114 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