F.92
FAULT CODE
Vaillant
Coding Resistor Fault
High Severity
Engineer Required
The coding resistor on the PCB does not match the entered gas family. The boiler cannot verify it is set up for the correct fuel type.
Step-by-Step Fix Guide
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Step 1
A Gas Safe engineer needs to check the coding resistor on the PCB
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Step 2
The gas family check must be repeated and the correct gas family entered
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Step 3 Engineer only
The resistor may need replacing if damaged
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.