Green LED illuminated Low

Halstead Green LED illuminated Fault Code

Also written as GREENLEDILLUMINATED — same fault.

The Halstead Green LED illuminated fault code means: your boiler is working perfectly and is currently in standby mode, simply waiting for you to turn on a tap or adjust the heating.. It appears on 1 Halstead model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Power ON. Boiler is in service. If no other LED’s are illuminated, the appliance is awaiting a demand for heating or hot water.

DIY fix possible

Check your room thermostat is set to a temperature higher than the current room temperatureTurn on a hot water tap to see if the boiler activatesVerify the boiler mode selector is set to the desired 'Heating and Hot Water' position

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Halstead models that show the Green LED illuminated fault code

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

Source

Halstead Green 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