BoilerFaultCodesIdeal 407 Fault Code
The Ideal 407 fault code means: your boiler's internal computer has suffered a technical failure and is unable to control the heating or hot water operations.. It appears on 2 Ideal models in our database.
Technical description: Internal failure - electronic
What causes the Ideal 407 fault?
This fault occurs when the boiler's control centre, known as the PCB, experiences a critical hardware failure or a communication breakdown between its internal components. The most common reason is an electrical short or component degradation on the circuit board itself, preventing it from safely managing the boiler's functions. In some cases, loose or damaged internal wiring can also disrupt the signals required for the system to operate.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the 407 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 407 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026