L6
FAULT CODE
Ideal
False Flame Lockout
High Severity
Engineer Required
The boiler has detected an ionisation signal when the gas valve should be closed. This is a serious safety fault.
Step-by-Step Fix Guide
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Step 1
Do not attempt repairs
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Step 2 Engineer only
Call a Gas Safe engineer immediately to inspect the ionisation electrode and gas valve
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.