BoilerFaultCodesIdeal L-A Fault Code
Also written as LA — same fault.
The Ideal L-A fault code means: your boiler has become too hot and has automatically shut itself down to prevent damage and ensure safety.. It appears on 9 Ideal models in our database.
Technical description: Boiler Overheat Thermostat: This thermostat will shut down the boiler in the event of overheating
What causes the Ideal L-A fault?
This fault occurs when the water temperature inside the boiler exceeds a safe limit, causing the safety sensors to cut the power. The most common reasons are a pump failure that stops water from moving or a blockage in the system that prevents heat from being carried away from the boiler.
This issue is more frequent in autumn or winter when the heating is first turned on after a long summer break, as internal pumps are prone to seizing up during periods of inactivity.
DIY fix possible
Check that your radiator valves are openEnsure there is enough water pressure in the system (usually between 1 and 1.5 bar on the gauge)Once the boiler has cooled down, press the reset button on the front control panel
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Ideal models that show the L-A fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L-A 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 7 July 2026