BoilerFaultCodesDaikin 5 Fault Code
The Daikin 5 fault code means: your boiler is struggling to keep its flame lit, which is usually caused by a blockage in the drainage pipe or an incorrect gas supply.. It appears on 3 Daikin models in our database.
Technical description: Poor flame signal. Possible causes: Condensate drain blocked, Check adjustment of gas valve.
DIY fix possible
Check the external white plastic condensate pipe for signs of freezing or blockages.If the pipe is frozen, gently pour warm (not boiling) water over it to thaw the ice.Restart the boiler using the reset button to see if the flame stays lit.
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Daikin models that show the 5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Daikin 5 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