How much does it cost to fix Ideal error code LLLLL:::::AAAAA?

Typical repair cost for the Ideal LLLLL:::::AAAAA fault is £120-250 including labour.

LLLLL:::::AAAAA High

Ideal LLLLL:::::AAAAA Fault Code

Q: What does the Ideal LLLLL:::::AAAAA fault code mean?

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage or safety issues.

Also written as LLLLLAAAAA — same fault.

The Ideal LLLLL:::::AAAAA fault code means: your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage or safety issues.. It appears on 3 Ideal models in our database.

Technical description: Boiler is not working for central heating or hot water and indicates an overheat condition.

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ideal models that show the LLLLL:::::AAAAA fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal LLLLL:::::AAAAA 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