BoilerFaultCodesIdeal 05 Fault Code
The Ideal 05 fault code means: your boiler's internal computer brain has developed a fault and can no longer control the heating system, meaning the boiler has shut down for safety.. It appears on 4 Ideal models in our database.
Technical description: Controller - internal failure - electronic
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ideal models that show the 05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 05 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal Classic SE15P FF manual (PDF)
- Ideal Logic Max Heat 2 manual (PDF)
- Ideal Maximiser SE manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026