Flashing LD2 High

Biasi Flashing LD2 Fault Code

Also written as FLASHINGLD2 — same fault.

The Biasi Flashing LD2 fault code means: your boiler has detected low water pressure or a circulation issue, preventing it from heating up to protect the system.. 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: 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 £90-180 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If pressure is low, use the filling loop underneath the boiler to top it up until the needle reaches 1.2 bar.Ensure all radiator valves are open and bleed any air from the radiators using a radiator key.

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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 27 April 2026