BoilerFaultCodesZanussi Ln Fault Code
Also written as LN — same fault.
The Zanussi Ln fault code means: your boiler is struggling to keep its flame lit, which means it cannot heat your water or radiators reliably.. It appears on 1 Zanussi model in our database.
Technical description: Flame Loss
What causes the Zanussi Ln fault?
This fault occurs when the boiler's internal sensor can no longer detect a steady flame after the burner has ignited. The most common reasons are a worn-out sensing probe that can't 'see' the fire, or an unstable gas supply that causes the flame to drift and extinguish prematurely.
This fault can be more frequent during extreme winter cold, as freezing temperatures can affect gas pressure or cause moisture to interfere with the ignition components.
DIY fix possible
Check that your gas emergency control valve is open and you have credit on your gas meter.Check if other gas appliances in your home, like a hob, are working correctly.Reset the boiler by turning the mode knob to 'RE' and then back to your desired setting.During freezing weather, check that the white plastic condensate pipe leading outside is not frozen.
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Zanussi models that show the Ln fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Zanussi Ln 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