Boiler ON (green) light off High

Biasi Boiler ON (green) light off Fault Code

Also written as BOILERONGREENLIGHTOFF — same fault.

The Biasi Boiler ON (green) light off fault code means: your boiler has lost power completely, meaning it will not turn on or provide any heating or hot water.. It appears on 1 Biasi 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: No mains electricity supply, blown fuse (F1 or F2), or faulty control circuit.
Typical repair cost £90-250 (including labour)

DIY fix possible

Check if other appliances in your home have powerCheck your main property fuse box to see if a circuit has trippedEnsure the boiler's power switch on the wall (fused spur) is turned on

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Biasi models that show the Boiler ON (green) light off fault code

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

Source

Biasi Boiler ON (green) light off fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

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