8 High

Daikin 8 Fault Code

The Daikin 8 fault code means: your boiler has detected an issue with the internal fan that blows exhaust gases safely outside, causing it to stop working so the heating and hot water have turned off for safety.. 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: Fan rpm is not correct: Fan is coming up against cover insulation, Wiring between fan and cover, Check the wiring for faulty contact wire, Check and/or replace fan, Replace boiler controller.
Typical repair cost £150-300 (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 8 fault code

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

Source

Daikin 8 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 31 August 2026