A14
Fondital
Gas Valve Modulation / Overpressure Fault
Boiler displays A14; the burner stops, which may occur during DHW draw-off, and the water temperature drops suddenly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrectly adjusted gas valve on Fondital boiler, Faulty gas valve coil, Gas supply pressure outside specification, Defective main PCB gas control circuit
How to Fix / Troubleshooting
Safety: Gas adjustments must only be carried out by a licensed gas technician. Do not attempt to adjust the gas valve yourself.
User checks:
- Other gas appliances: Confirm that they operate normally. If all appliances are affected, contact your gas supplier.
- Reset: Reset the boiler once. If A14 reappears, call a qualified technician.
Technician actions:
- Measure inlet and burner pressure and compare them with Fondital data plate values.
- Check the operation of the gas valve coils and replace the gas valve assembly if faulty.
- Verify the correct modulation control signal from the main PCB.
- Perform combustion analysis and adjust the gas valve as per Fondital procedures.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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