F2
FAULT CODE
Viessmann
Burner Start Fault
High Severity
Engineer Required
The burner has failed to ignite after the start-up sequence. The gas supply, ignition electrode, or gas valve may be at fault.
Cold Weather Note
In very cold weather, a frozen condensate pipe can prevent ignition. Check the condensate pipe for ice.
Step-by-Step Fix Guide
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Step 1
Check if other gas appliances in the home are working
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Step 2
Try resetting the boiler by pressing the reset button
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Step 3 Engineer only
If the fault persists after two resets, call a Gas Safe 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.