Ruud
Ignition System Failure
Inducer motor runs but burners do not light, then inducer shuts off and retries.
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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
Failed hot surface ignitor, Loose ignitor wiring, Faulty gas valve coil, Control board not sending 24V to gas valve
How to Fix / Troubleshooting
Safety: Turn off gas and power before removing burner access panel. Avoid touching the ignitor element with bare fingers.
Steps to check:
- Observe ignition sequence: With the panel on and power restored, watch through the sight glass. Confirm inducer starts, pressure switch closes, then check if the ignitor glows.
- Inspect ignitor: If the ignitor does not glow, remove it and check for cracks or breaks. Replace with the correct Ruud OEM ignitor if damaged.
- Check ignitor connector: Ensure the plug at the ignitor and at the control board is fully seated and not burnt.
- Gas valve operation: If the ignitor glows but burners never light and you do not smell gas, the gas valve may not be opening. This requires a technician to test 24V at the valve and gas pressure.
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Repair Difficulty
Medium
3/5
Required Part
Hot Surface Ignitor
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