How much does it cost to fix Biasi error code Lock-out signal lamp D blinks?

Typical repair cost for the Biasi Lock-out signal lamp D blinks fault is £80-130 including labour.

Lock-out signal lamp D blinks Low

Biasi Lock-out signal lamp D blinks Fault Code

Q: What does the Biasi Lock-out signal lamp D blinks fault code mean?

Your boiler is notifying you that a change in its internal settings was detected and needs to be saved by a qualified technician.

Also written as LOCKOUTSIGNALLAMPDBLINKS — same fault.

The Biasi Lock-out signal lamp D blinks fault code means: your boiler is notifying you that a change in its internal settings was detected and needs to be saved by a qualified technician.. It appears on 1 Biasi model in our database.

Technical description: Indicates the setting has changed and must be memorised during output/frequency adjustment.

Typical repair cost £80-130 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Biasi models that show the Lock-out signal lamp D blinks fault code

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

Riva Advance M96.24SM Repair: £80-130

Source

Biasi Lock-out signal lamp D blinks 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