F.65
FAULT CODE
Vaillant
Electronics Temperature Too High
High Severity
Engineer Required
The temperature of the electronics/PCB itself is too high. This can be caused by an external heat source near the boiler or an internal electrical fault.
Step-by-Step Fix Guide
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Step 1
Check there are no heat sources near the boiler
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Step 2
Turn off the boiler and allow to cool
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Step 3 Engineer only
Call a Gas Safe engineer if the fault persists after cooling
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.