How much does it cost to fix Ideal error code L.......A........?

Typical repair cost for the Ideal L.......A........ fault is £120-£350 including labour.

L.......A........ High

Ideal L.......A........ Fault Code

Q: What does the Ideal L.......A........ fault code mean?

Your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water circulation or a blockage in the system.

Also written as LA — same fault.

The Ideal L.......A........ fault code means: your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water circulation or a blockage in the system.. It appears on 12 Ideal models in our database.

Technical description: OVERHEAT ERROR

What causes the Ideal L.......A........ fault?

This fault occurs when the water inside the boiler exceeds a safe temperature limit, causing the safety sensors to shut the system down to prevent damage. The most common reasons are a failed internal pump that isn't moving the water away fast enough or a buildup of sludge and debris creating a blockage in the heat exchanger.

This issue often appears when the heating is first turned on after summer, as pump components can seize up after months of inactivity.

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that your boiler pressure is between 1 and 1.5 bar on the pressure gaugeEnsure all radiator valves are fully open and not turned offCheck if any bypass valves are closed and try resetting the boiler once cooled

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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 27 April 2026