BoilerFaultCodesIdeal LA/HA Fault Code
Also written as LAHA — same fault.
The Ideal LA/HA fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 5 Ideal models in our database.
Technical description: Overheat (With V9 Primary Control PCB, will display 3 horizontal lines upon reset and not refire until temperature drops below 50oC)
What causes the Ideal LA/HA fault?
This fault occurs when the water inside the boiler exceeds a safe temperature, triggering a safety sensor to cut the power. The most common reasons are a pump failure that stops water from moving or a blockage within the main heat exchanger that prevents heat from transferring correctly. It can also be caused by air trapped in the system or a faulty sensor providing an incorrect reading.
This fault is frequently seen at the start of autumn when heating systems are switched back on after being idle, as circulation pumps can become seized over the summer.
DIY fix possible
Check that your radiator valves are open and not turned to zeroEnsure there is enough water pressure in the system (typically between 1 and 1.5 bar)Press the reset button to see if the fault clears
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the LA/HA fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LA/HA 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