A16
FAULT CODE
Ferroli
Gas Valve Lockout — Failed to Close
High Severity
Engineer Required
The gas valve has failed to close correctly after the burner should have stopped. Safety-critical.
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 at the mains
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Step 3 Engineer only
Call a Gas Safe registered engineer — do not restart until inspected
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.