LN
FAULT CODE
Ideal
Flame Loss Lockout (Alternative Code)
Medium Severity
DIY Check Possible
On some Ideal models, LN is a lockout version of FN/F2, indicating repeated flame loss requiring manual reset.
Step-by-Step Fix Guide
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Step 1
Check gas supply and condensate pipe
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Step 2
Press the reset button
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Step 3
If LN returns, call a Gas Safe engineer to investigate the ignition system
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.