BoilerFaultCodesZanussi LC Fault Code
The Zanussi LC fault code means: your boiler has tried and failed to start up five times in a short window and has now locked itself out for safety.. It appears on 1 Zanussi model in our database.
Technical description: Ignition lockout - 5 restart attempts within 15 minutes
What causes the Zanussi LC fault?
This fault occurs when your boiler detects that it has lost its flame five times within a fifteen-minute window, forcing it to stop running to ensure your safety. The root cause is usually a failure in the ignition process, meaning the boiler can't reliably light the gas or recognize that a flame is present. This is often caused by a worn-out ignition spark, a faulty sensor, or an inconsistent flow of gas to the burner.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Zanussi models that show the LC fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Zanussi LC fault code information on this page is sourced and cross-checked against the official Zanussi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026