F51
Ferroli
Gas Valve Control Fault
Boiler shows F51; may be related to gas valve or modulation control issues.
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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
Faulty gas valve coil, Loose gas valve connector, PCB modulation output fault, Incorrect wiring
How to Fix / Troubleshooting
Safety first: Gas valve work must be done by a Gas Safe engineer.
- Reset once: If F51 returns, do not continue to reset.
- Engineer checks:
- Measure resistance of gas valve coils and compare to spec.
- Check wiring and connectors to the gas valve.
- Verify PCB modulation signal; replace PCB or gas valve as required.
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Repair Difficulty
Professional Required
5/5
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