S.36
FAULT CODE
Vaillant
Status: Boiler Firing for Heating Demand
Medium Severity
DIY Check Possible
The burner is running to satisfy a central heating demand. This is normal operating status.
Step-by-Step Fix Guide
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Step 1
Your boiler is operating normally and producing heat
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Step 2
No action required
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.