BoilerFaultCodesIdeal 0L Fault Code
The Ideal 0L fault code means: your boiler is currently trying to light the flame to start provide heating or hot water, which is a normal part of its startup sequence.. It appears on 1 Ideal model in our database.
Technical description: Unit is in ignition phase
What causes the Ideal 0L fault?
This code appears when the boiler is in the middle of its normal starting sequence and is trying to establish a flame. It is caused by the control board sending a spark to the burner to ignite the gas required for heating or hot water. If the code stays on the screen without the boiler firing up, it usually means the system is struggling to sense the flame or the gas is not reaching the burner efficiently.
DIY fix possible
No action required; this is a normal status message.Wait for the boiler to complete its ignition sequence.If the code persists for several minutes without firing, try pressing the reset button.
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Gas Safe Register →Ideal models that show the 0L fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 0L 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