50
FAULT CODE
Viessmann
No Flame Detected
High Severity
Engineer Required
The boiler has attempted ignition but no flame has been detected by the ionisation electrode.
Cold Weather Note
A frozen condensate pipe can cause ignition failure. Check the condensate pipe for ice.
Step-by-Step Fix Guide
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Step 1
Check that the gas supply is on and other gas appliances work
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Step 2
Try resetting the boiler
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Step 3 Engineer only
If the fault recurs, a Gas Safe engineer should check the electrode, gas valve, and ignition leads
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.