Overheat Lockout 4/4 High

Ideal Overheat Lockout 4/4 Fault Code

Also written as OVERHEATLOCKOUT44 — same fault.

The Ideal Overheat Lockout 4/4 fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 1 Ideal model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Overheat lockout (screen 4 of 4) — restart, contact installer if persists
Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that all radiator valves are fully open to allow water to flow.Ensure there are no blockages or trapped air by bleeding your radiators.Press the 'Restart' button on the boiler control panel once the system has cooled down.

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Ideal models that show the Overheat Lockout 4/4 fault code

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

Source

Ideal Overheat Lockout 4/4 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