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

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

Lock-out signal lamp D blinks Low

Boiler Fault Code Lock-out signal lamp D blinks

Also written as LOCKOUTSIGNALLAMPDBLINKS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lock-out signal lamp D blinks appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is notifying you that a change in its internal settings was detected and needs to be saved by a qualified technician. (As reported on Biasi Riva Advance M96.24SM)

Pick your boiler brand for the Lock-out signal lamp D blinks fix

Biasi Lock-out signal lamp D blinks 1 model

Source

Information for the Lock-out signal lamp D blinks fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

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