S.07
FAULT CODE
Vaillant
Fan Running After Shutdown (Aftercool)
Low Severity
DIY Check Possible
The fan continues to run for a short time after the burner has switched off to cool the heat exchanger. This is normal behaviour.
Step-by-Step Fix Guide
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Step 1
No action required — this is normal operation
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Step 2
The fan will stop automatically within a few minutes
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.