F.62
FAULT CODE
Vaillant
Gas Valve Closure Delay Error
High Severity
Engineer Required
The gas valve is taking too long to close after the boiler shuts down, indicating a fault with the valve mechanism or its electronic driver circuit.
Step-by-Step Fix Guide
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Step 1
This is a safety-critical fault
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Step 2
Turn off the boiler immediately
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Step 3 Engineer only
Call a Gas Safe registered engineer
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.