Ducane
Flame Dropout / Safety Trip
Furnace starts then shuts off within 30 seconds, repeatedly
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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
Dirty flame sensor, Loose ground connection on Ducane furnace, Intermittent gas valve operation, Drafts affecting flame
How to Fix / Troubleshooting
Safety first: Turn off power and gas before servicing flame sensor or wiring.
- Step 1 – Clean flame sensor: Remove and gently clean with fine steel wool, then reinstall.
- Step 2 – Check ground: Verify the furnace ground wire is secure to the cabinet and that burner screws are tight.
- Step 3 – Inspect for drafts: Ensure no strong drafts from open doors or vents are blowing directly on the burner area.
- Step 4 – Professional diagnosis: If problem persists, a technician should measure flame signal and test the gas valve and control board.
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Repair Difficulty
Medium
3/5
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