(G) LED turning on High

Ariston (G) LED turning on Fault Code

Also written as GLEDTURNINGON — same fault.

The Ariston (G) LED turning on fault code means: your boiler has switched itself off because it reached an unsafe temperature to prevent damage to the internal components.. It appears on 3 Ariston 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: Shutdown due to overheating
Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that all radiator valves are fully open to allow water to circulate.Ensure your system pressure is topped up to between 1 and 1.5 bar.Wait 15 minutes for the system to cool down and gently press the reset button.

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Ariston models that show the (G) LED turning on fault code

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

Source

Ariston (G) LED turning on 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