BoilerFaultCodesIdeal Burner fails to light Fault Code
Also written as BURNERFAILSTOLIGHT — same fault.
The Ideal Burner fails to light fault code means: your boiler is failing to light the gas burner and has gone into a safety lockout mode to prevent unburned gas from building up.. It appears on 1 Ideal model in our database.
Technical description: The lockout light will be illuminated at the end of the 4 second ignition period and the fan will run on.
What causes the Ideal Burner fails to light fault?
This fault occurs when the boiler's control system attempts to start the heating process but cannot detect a stable flame. The most common reasons are a lack of spark from a worn ignition lead or the gas valve failing to open and deliver fuel to the burner. Because the boiler cannot confirm the gas has lit safely, it shuts down to prevent any hazards.
This issue is frequently seen during the first cold snap of autumn when internal components like the gas valve can stick after being inactive over the summer months.
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 Burner fails to light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Burner fails to light 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