How much does it cost to fix Ideal error code Overheat lockout?

Typical repair cost for the Ideal Overheat lockout fault is £120-350 including labour.

Overheat lockout High

Ideal Overheat lockout Fault Code

Q: What does the Ideal Overheat lockout fault code mean?

Your boiler has switched itself off because it has reached too high a temperature, usually due to a lack of water or a blockage in the system.

Also written as OVERHEATLOCKOUT — same fault.

The Ideal Overheat lockout fault code means: your boiler has switched itself off because it has reached too high a temperature, usually due to a lack of water or a blockage in the system.. It appears on 7 Ideal models in our database.

Technical description: Bleed radiators, refill system to 1.0 bar, check that radiator and boiler valves are open and reset boiler. If fault continues call an Engineer

Typical repair cost £120-350 (including labour)

DIY fix possible

Check the pressure gauge and refill the system to 1.0 bar if it is too lowBleed all radiators to remove trapped airEnsure all radiator valves and the boiler service valves are fully openPress the reset button on the front of the boiler

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Ideal models that show the Overheat lockout fault code

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

Source

Ideal Overheat lockout 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