Fraser-Johnston
Hot Surface Ignitor Failure
Furnace ignitor does not glow; inducer runs and pressure switch closes but no ignition.
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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
Cracked hot surface ignitor, Open ignitor circuit, Loose ignitor connector, Failed ignitor relay on IFC board
How to Fix / Troubleshooting
Safety first: Turn off power and gas before servicing the ignitor.
- Inspect ignitor: Locate the hot surface ignitor near the burners. Look for visible cracks or breaks in the element.
- Test resistance: Disconnect the ignitor and measure resistance with a multimeter. An open circuit indicates failure.
- Replace ignitor: Install a Fraser‑Johnston compatible ignitor, avoiding contact with the carbide element (hold by the base). Reconnect wiring securely.
- Test operation: Restore power and gas, then call for heat to verify the ignitor glows and burners light.
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Repair Difficulty
Medium
3/5
Required Part
Hot Surface Ignitor
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