F.63
FAULT CODE
Vaillant
EEPROM Error
High Severity
Engineer Required
There is an internal electronic memory (EEPROM) fault on the PCB. The boiler's control board cannot read or write its configuration data.
Step-by-Step Fix Guide
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Step 1
Try turning the boiler off at the mains for 10 minutes, then back on
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Step 2 Engineer only
If the fault persists, the PCB (Printed Circuit Board) will likely need replacing by 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.