F16
FAULT CODE
Saunier Duval
False Flame After Burner Stop
High Severity
Engineer Required
The boiler has detected a flame signal for more than 5 seconds after the burner was commanded to stop. A serious safety fault — the gas valve needs checking.
Step-by-Step Fix Guide
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Step 1
Turn off the gas isolation valve immediately
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe registered engineer immediately
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.