F.93
FAULT CODE
Vaillant
Incorrect Parameter Settings
Medium Severity
Engineer Required
The boiler has been configured with an incorrect setting — typically after a PCB replacement or factory reset.
Step-by-Step Fix Guide
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Step 1 Engineer only
A Gas Safe engineer needs to reconfigure the boiler parameters using the diagnostic menu
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.