30 Emergency

Daikin 30 Fault Code

The Daikin 30 fault code means: your boiler's safety system has detected a potential electronic fault with the mechanism that controls the gas flow, so it has shut down to keep your home safe.. It appears on 2 Daikin models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Gas valve relay fault
Typical repair cost £200-450 (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 30 fault code

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

Source

Daikin 30 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