F8
Ideal
Gas Valve Control Fault
Display shows F8, heater may start then shut down, or not start at all.
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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, Internal gas valve blockage, Control board output fault to gas valve
How to Fix / Troubleshooting
Critical safety warning: Gas valve work must only be carried out by a qualified gas engineer. Do not attempt to open or adjust the gas valve yourself.
- Check external gas isolation: Ensure the gas cock to the heater is fully open.
- Visual inspection only: With power isolated, remove the front cover and visually confirm the gas valve electrical plug is firmly seated and wiring is intact.
- Do not adjust screws: Do not turn any adjustment screws or regulators on the gas valve.
- Call a professional: If F8 remains after a reset, contact an Ideal-approved service technician to test the gas valve coil resistance and control board outputs.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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