How much does it cost to fix boiler error code All Lamps ON?

Typical repair cost for the boiler All Lamps ON fault is £250-£400 including labour.

All Lamps ON High

Boiler Fault Code All Lamps ON

Also written as ALLLAMPSON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code All Lamps ON 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's internal computer has suffered a critical failure and can no longer control the heating or hot water functions. (As reported on Biasi Garda M90f)

Pick your boiler brand for the All Lamps ON fix

Biasi All Lamps ON 1 model

Source

Information for the All Lamps ON 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