BoilerFaultCodesIdeal Overheat Lockout 1/4 Fault Code
Also written as OVERHEATLOCKOUT14 — same fault.
The Ideal Overheat Lockout 1/4 fault code means: your boiler has shut down because the internal water pressure has dropped too low to operate safely, causing it to get too hot.. It appears on 1 Ideal model in our database.
Technical description: Overheat lockout (screen 1 of 4) — fill system to 1.0 bar
DIY fix possible
Locate the filling loop (usually two blue handles or a metal braided hose underneath the boiler).Slowly open the valves until the needle on the pressure gauge reaches 1.5 bar.Close the valves tightly and press the 'Restart' button on the boiler control panel.
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Ideal models that show the Overheat Lockout 1/4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Overheat Lockout 1/4 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