BoilerFaultCodesIdeal OVERHEAT LOCKOUT Fault Code
Also written as OVERHEATLOCKOUT — same fault.
The Ideal OVERHEAT LOCKOUT fault code means: your boiler has switched itself off because it has become too hot internally, usually because there isn't enough water moving through the system to cool it down.. It appears on 12 Ideal models in our database.
Technical description: Overheat lockout — fill system, bleed radiators, restart
DIY fix possible
Check the pressure gauge and top up the system to 1.5 bar if it is lowBleed all radiators to remove trapped airEnsure all radiator valves and the boiler isolation valves are fully openPress the 'Restart' button on the boiler display
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like OVERHEAT LOCKOUT: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ideal models that show the OVERHEAT LOCKOUT fault code
Click a model for the full fault code list and model-specific repair notes.
- Atlantic Combi Repair: £150-300
- Concorde Repair: £120-350
- Icos System Repair: £120-250
- Logic Code Combi ESP1 Repair: £120-250
- Logic Max Combi Repair: £120-250
- Logic Max Heat 2 Repair: £120-250
- Logic Max System 2 Repair: £120-£450
- Vogue Repair: £100-350
- Vogue Combi Repair: £120-250
- Vogue Max Combi Repair: £100-250
- Vogue Max System Repair: £100-280
- Vogue System Repair: £120-250
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.
- Ideal Atlantic Combi manual (PDF)
- Ideal Icos System manual (PDF)
- Ideal Logic Code Combi ESP1 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026