BoilerFaultCodesDaikin 12-69 Fault Code
Also written as 1269 — same fault.
The Daikin 12-69 fault code means: your boiler is struggling to automatically adjust its internal settings to ensure the gas burns efficiently, which may lead to it shutting down for safety.. It appears on 1 Daikin model in our database.
Technical description: Offset adaptation at limit
What causes the Daikin 12-69 fault?
This fault occurs when the boiler's control system can no longer fine-tune the gas and air mixture to maintain a safe and efficient flame. It is usually caused by a worn-out sensing electrode failing to detect the flame correctly or a gas valve that is drifting out of its required operating range.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Daikin models that show the 12-69 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin 12-69 fault code information on this page is sourced and cross-checked against the official Daikin service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026