Green LED flashing High

Saunier Duval Green LED flashing Fault Code

Also written as GREENLEDFLASHING — same fault.

The Saunier Duval Green LED flashing fault code means: your boiler has lost power or has an electrical fault, meaning it cannot start up to provide heating or hot water.. It appears on 1 Saunier Duval 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: Check the 230 V electrical supply circuit; connector 230 V across L and N; PCB fuse blown; PCB faulty
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if other appliances in the house have powerCheck your main consumer unit (fuse box) to see if a circuit has trippedEnsure the boiler's fused spur switch (usually near the boiler) is turned on

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Saunier Duval models that show the Green LED flashing fault code

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

Source

Saunier Duval Green LED flashing fault code information on this page is sourced and cross-checked against the official Saunier Duval service / installation manuals for each affected model.

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