L8
FAULT CODE
Ideal
Flue Temperature Lockout
High Severity
Engineer Required
The flue gas temperature sensor has detected an unsafe temperature, causing a lockout.
Step-by-Step Fix Guide
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Step 1
Do not attempt to inspect the flue yourself
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe engineer to inspect the flue and temperature sensor
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.