BoilerFaultCodesIdeal 47 Fault Code
The Ideal 47 fault code means: your boiler is unable to start the small pilot flame needed to ignite the main heating system.. It appears on 1 Ideal model in our database.
Technical description: PILOT WILL NOT LIGHT
What causes the Ideal 47 fault?
This fault occurs when the boiler's internal safety system detects that the small pilot light has failed to ignite or stay lit. Most commonly, this is caused by a blocked nozzle preventing gas flow or a worn-out sensor failing to tell the boiler that the flame is actually present.
This issue is frequently seen after the summer months when a boiler has been turned off, as dust can settle in the pilot assembly or the gas valve can become slightly stuck during the period of inactivity.
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 47 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 47 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