S.46
FAULT CODE
Vaillant
Comfort Mode — Flame Loss at Minimum Load
Medium Severity
Engineer Required
Status code: Flame lost at minimum burner output while in comfort mode. The boiler is blocking and will retry.
Step-by-Step Fix Guide
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Step 1
Wait for the boiler to retry automatically
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Step 2 Engineer only
If this status appears frequently, call a Gas Safe engineer to check gas pressure and combustion settings
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.