3 High

Daikin 3 Fault Code

The Daikin 3 fault code means: your boiler has temporarily paused its operation due to a technical error and is waiting for conditions to change or a minor internal issue to clear before it can restart itself.. It appears on 3 Daikin models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The boiler will not start, but will start automatically after the problem is solved (Blocking)
Typical repair cost £120-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Daikin models that show the 3 fault code

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

Source

Daikin 3 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 7 July 2026