BoilerFaultCodesIdeal Overheat Lockout 2/4 Fault Code
Also written as OVERHEATLOCKOUT24 — same fault.
The Ideal Overheat Lockout 2/4 fault code means: your boiler has shut down because the water inside it has become too hot, usually due to low water pressure or trapped air.. It appears on 1 Ideal model in our database.
Technical description: Overheat lockout (screen 2 of 4) — bleed radiators, refill
DIY fix possible
Check the pressure gauge and top up the system to 1.5 bar using the filling loopBleed your radiators with a radiator key to remove trapped airPress the 'Reset' button on the front of the boiler control panel
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Ideal models that show the Overheat Lockout 2/4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Overheat Lockout 2/4 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