BoilerFaultCodesGlow-worm d.05 Fault Code
Also written as D05 — same fault.
The Glow-worm d.05 fault code means: your boiler is simply displaying the current temperature it is aiming to reach for your radiators, which is a normal status message rather than a breakdown.. It appears on 7 Glow-worm models in our database.
Technical description: Determined target heating flow temperature
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Glow-worm models that show the d.05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm d.05 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
- Glow-worm Compact manual (PDF)
- Glow-worm Energy7 Combi manual (PDF)
- Glow-worm Flexicom 24c / 28c manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026