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.

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.

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

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

Break-even maths on monthly cover.

7 signs repair isn't worth it anymore.

Realistic UK prices for a swap.