F.67
FAULT CODE
Vaillant
Electronics Flame Signal Error
High Severity
Engineer Required
The PCB is receiving an unexpected or erroneous flame signal. This indicates a fault with the ionisation electrode circuit or the main PCB itself.
Step-by-Step Fix Guide
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Step 1
Do not repeatedly reset
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Step 2 Engineer only
Call a Gas Safe engineer to test the ionisation electrode and PCB
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.