Red LED I (Overheat) High

Ariston Red LED I (Overheat) Fault Code

Also written as REDLEDIOVERHEAT — same fault.

The Ariston Red LED I (Overheat) fault code means: your boiler has automatically turned itself off because it has detected that the water inside is getting dangerously hot.. It appears on 1 Ariston 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: Shutdown Due To Overheating: In the event that the safety limit is exceeded for the temperature of the water in the boilers exchanger
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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Ariston models that show the Red LED I (Overheat) fault code

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

Source

Ariston Red LED I (Overheat) fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026