Overheat LED illuminated High

Halstead Overheat LED illuminated Fault Code

Also written as OVERHEATLEDILLUMINATED — same fault.

The Halstead Overheat LED illuminated fault code means: your boiler has detected that it is running too hot and has automatically shut down to prevent damage, meaning you currently have no heating or hot water.. It appears on 4 Halstead models 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: Investigate the cause of the overheat situation and rectify. Possible causes: Lack of water; Lack of water flow; Faulty overheat thermostat; Faulty thermistor; Faulty aquastat
Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Halstead models that show the Overheat LED illuminated fault code

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

Source

Halstead Overheat LED illuminated fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026