BoilerFaultCodesDaikin 5 Fault Code
The Daikin 5 fault code means: your boiler is having trouble lighting or staying lit because it cannot detect a steady flame, which is likely due to a blocked drainpipe, low gas supply, or an ignition issue.. It appears on 3 Daikin models in our database.
Technical description: Poor flame signal - Condense output blocked. Gas supply pressure too low, or disappears. Check ignition unit and ignition cable. Check setting of gas block. Check earthing. Check air supply and gas output for possible recirculation of flue gases.
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 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 31 August 2026