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

Typical repair cost for the Ideal Thermal fuse lockout fault is £0-120 including labour.

Thermal fuse lockout High

Ideal Thermal fuse lockout Fault Code

Q: What does the Ideal Thermal fuse lockout fault code mean?

Your boiler has overheated because a safety switch has tripped to protect the internal components, and it now needs to be manually restarted.

Also written as THERMALFUSELOCKOUT — same fault.

The Ideal Thermal fuse lockout fault code means: your boiler has overheated because a safety switch has tripped to protect the internal components, and it now needs to be manually restarted.. It appears on 7 Ideal models in our database.

Technical description: Reset boiler

Typical repair cost £0-120 (including labour)

DIY fix possible

Locate the reset knob or button on the front control panel.Turn the reset knob to the 'RESET' position and hold for 2 seconds, then release.Wait for the boiler to run through its startup sequence to see if heat is restored.

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Ideal models that show the Thermal fuse lockout fault code

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

Source

Ideal Thermal fuse 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