F20
Ideal
Incorrect Gas Type / Configuration Fault
Ideal furnace shows F20, no ignition, or immediate lockout with gas-related warning
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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
Furnace configured for wrong gas (LPG vs natural gas), incorrect injector set fitted, misconfigured gas valve settings after service
How to Fix / Troubleshooting
Safety: Gas type and configuration must only be set by a qualified gas engineer. Operating on the wrong gas can be extremely dangerous.
Steps (user-level):
- Check documentation: Confirm on the rating plate of your Ideal furnace that the gas type matches your supply (e.g., natural gas or LPG).
- Do not attempt adjustments: Do not change any dip switches, jumpers, or valve settings yourself.
- Contact installer or service provider: If the furnace was recently installed or converted, contact the installer to verify that the correct conversion kit and settings were used.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Conversion Kit
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