FE
FAULT CODE
Viessmann
EMC Interference / PCB Fault
High Severity
Engineer Required
Strong electromagnetic interference (EMC) nearby or a faulty main PCB is causing the burner to block or show errors.
Step-by-Step Fix Guide
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Step 1
Check for any new electrical equipment that may cause EMC interference nearby
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Step 2
Turn off at mains for 10 minutes, then restart
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Step 3 Engineer only
If FE persists, call a Gas Safe engineer — the PCB may need replacing
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.