BoilerFaultCodesDaikin 4 Fault Code
The Daikin 4 fault code means: your boiler is currently trying to light the flame using electrical sparks, which is a normal part of its startup sequence.. It appears on 3 Daikin models in our database.
Technical description: Igniting: The boiler controller is being ignited by means of electrical sparks.
DIY fix possible
Wait a few moments to see if the code disappears and the boiler starts normallyEnsure your gas supply is turned on at the meterIf the boiler fails to light after several attempts, try a simple reset
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Daikin models that show the 4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin 4 fault code information on this page is sourced and cross-checked against the official Daikin service / installation manuals for each affected model.
- Daikin Altherma Hybrid EHYKOMB33 manual (PDF)
- Daikin EKOMB 22 Combi manual (PDF)
- Daikin EKOMBG 22 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026