Flashing LD2 High

Biasi Flashing LD2 Fault Code

Also written as FLASHINGLD2 — same fault.

The Biasi Flashing LD2 fault code means: your boiler is struggling to detect water moving through the system, which prevents it from safely turning on your heating or hot water.. It appears on 2 Biasi 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: C.H. temperature / Primary circuit flow switch - Waiting for pressure/flow / Faulty C.H. temperature probe NTC / Faulty Primary circuit flow switch / Lack of water / Pump stuck / Air in the primary circuit
Typical repair cost £120-250 (including labour)

DIY fix possible

Check your boiler pressure gauge and ensure it is between 1.0 and 1.5 barIf the pressure is low, use the filling loop to top it up to the correct levelTurn the boiler off and back on again to clear the electronic fault

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Biasi models that show the Flashing LD2 fault code

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

Source

Biasi Flashing LD2 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