BoilerFaultCodesIdeal Main burner does not light Fault Code
Also written as MAINBURNERDOESNOTLIGHT — same fault.
The Ideal Main burner does not light fault code means: your boiler is failing to ignite the main gas flame, which means your heating and hot water will not work.. It appears on 1 Ideal model in our database.
Technical description: Check main burner injector, supply on terminals of main gas valve, or PCB connections
What causes the Ideal Main burner does not light fault?
This fault occurs when the boiler's control system attempts to start the heating cycle but fails to establish a sustained flame at the main burner. The most common reasons include a blockage in the pilot assembly preventing the gas from reaching the burner or an electrical failure where the gas valve is not being told to open by the control board.
This issue is more frequent during the first cold spell of autumn when dust or debris accumulated over the summer can clog the burner injectors or pilot light.
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 Main burner does not light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Main burner does not 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