Lennox
Flame Loss During Run
Furnace starts but shuts down after 30–60 seconds with no obvious error code at thermostat.
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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, Intermittent gas valve, Low gas pressure, Poor burner grounding to Lennox chassis
How to Fix / Troubleshooting
Safety: Turn off power and gas before servicing.
- 1. Clean flame sensor: Remove and clean as previously described.
- 2. Inspect burner ground: Ensure burner assembly screws are tight and ground wire is secure.
If problem persists, gas pressure and valve operation must be checked by a technician.
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Repair Difficulty
Hard
4/5
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